pytest: fix flake in test_setconfig_access.

We play with directory permissions, but sqlites needs that, and sometimes (due to a timer, perhaps?)
it gets really upset about it:

```
lightningd-1 2025-03-16T23:29:58.506Z INFO    lightningd: Server started with public key 0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518, alias JUNIORBEAM-f91eb11-modded (color #0266e4) and lightningd f91eb11-modded
lightningd-1 2025-03-16T23:29:58.617Z DEBUG   lightningd: Adding block 101: 55af171ade598f8c4f9a494eaaffe6b9f5ea64c7b0f3b273694148adf7ad7385
lightningd-1 2025-03-16T23:29:58.752Z TRACE   lightningd: Calling rpc_command hook of plugin cln-xpay
lightningd-1 2025-03-16T23:29:58.764Z TRACE   lightningd: Plugin cln-xpay returned from rpc_command hook call
lightningd-1 2025-03-16T23:29:58.784Z TRACE   lightningd: Calling rpc_command hook of plugin cln-xpay
lightningd-1 2025-03-16T23:29:58.840Z TRACE   lightningd: Plugin cln-xpay returned from rpc_command hook call
lightningd-1 2025-03-16T23:29:58.854Z TRACE   lightningd: Calling rpc_command hook of plugin cln-xpay
lightningd-1 2025-03-16T23:29:58.865Z DEBUG   gossipd: REPLY WIRE_GOSSIPD_NEW_BLOCKHEIGHT_REPLY with 0 fds
lightningd-1 2025-03-16T23:29:58.901Z **BROKEN** lightningd: Error executing statement: db/exec.c:108: UPDATE vars SET intval = intval + 1 WHERE name = 'data_version' AND intval = ?: attempt to write a readonly database
lightningd-1 2025-03-16T23:29:58.916Z **BROKEN** lightningd: Error executing statement: db/exec.c:108: UPDATE vars SET intval = intval + 1 WHERE name = 'data_version' AND intval = ?: attempt to write a readonly database
lightningd-1 2025-03-16T23:29:58.941Z **BROKEN** lightningd: FATAL SIGNAL 6 (version f91eb11-modded)
{'github_repository': 'ElementsProject/lightning', 'github_sha': 'f91eb118388dc1455c67d16079168fd0267ba248', 'github_ref': 'refs/pull/8112/merge', 'github_ref_name': 'HEAD', 'github_run_id': 13888173501, 'github_head_ref': 'flake-memleak', 'github_run_number': 12573, 'github_base_ref': 'master', 'github_run_attempt': '1', 'testname': 'test_setconfig_access', 'start_time': 1742167762, 'end_time': 1742167800, 'outcome': 'fail'}
----------------------------- Captured stderr call -----------------------------
Error executing statement: db/exec.c:108: UPDATE vars SET intval = intval + 1 WHERE name = 'data_version' AND intval = ?: attempt to write a readonly database
lightningd: FATAL SIGNAL 6 (version f91eb11-modded)
Log dumped in /tmp/lightning-crash.log.20250316232958
Lost connection to the RPC socket.Lost connection to the RPC socket.
=========================== short test summary info ============================
FAILED tests/test_misc.py::test_setconfig_access - AssertionError: Regex pattern did not match.
 Regex: 'Cannot write to config file /tmp/ltests-22a5dz1j/test_setconfig_access_1/lightning-1/regtest/config'
 Input: "RPC call failed: method: check, payload: {'command_to_check': 'setconfig', 'config': 'min-capacity-sat', 'val': 1000000}, error: Connection to RPC server lost."
ERROR tests/test_misc.py::test_setconfig_access - ValueError:
Node errors:
 - lightningd-1: had BROKEN messages
 - lightningd-1: Node exited with return code -6
```

So we move the db file for sqlite.

Signed-off-by: Rusty Russell <[email protected]>

Author: rustyrussell

tests/test_misc.py

@@ -4178,11 +4178,16 @@ def test_setconfig(node_factory, bitcoind):
         assert lines == ["# Created and update by setconfig, but you can edit this manually when node is stopped.", "min-capacity-sat=400000"]
 
 
-def test_setconfig_access(node_factory, bitcoind):
+def test_setconfig_access(node_factory, bitcoind, db_provider):
     """Test that we correctly fail (not crash) if config file/dir not writable"""
 
     # Disable bookkeeper, with its separate db which gets upset under CI.
-    l1 = node_factory.get_node(options={'disable-plugin': 'bookkeeper'})
+    options = {'disable-plugin': 'bookkeeper'}
+
+    # sqlite3 gets upset if the directory is non-writable when it tries to commit.
+    if db_provider == 'sqlite3':
+        options['wallet'] = os.path.join(node_factory.directory, 'l1.sqlite3')
+    l1 = node_factory.get_node(options=options)
 
     netconfigfile = os.path.join(l1.daemon.opts.get("lightning-dir"), TEST_NETWORK, 'config')