Merge bitcoin/bitcoin#26689: test: add add_wallet_options to TestShell

bcb7123 test: add add_wallet_options to TestShell (josibake)

Pull request description:

  following bitcoin/bitcoin@555519d, `TestShell` now always runs with `-disablewallet`. simple fix is to add `add_wallet_options` to `add_options`; looks like testshell was overlooked when adding in the `add_wallet_options` call to the functional tests in #26480

ACKs for top commit:
  amitiuttarwar:
    ACK bcb7123

Tree-SHA512: db554a8b3c8ff5bd10cab9592b316035a92f86a0a0ae8ff914de9687bbbb6fc2235bdf82c4cd40e4071782f8b6edf91aad372e82ed3b826c9d8ae39dbe3dbf57

Author: MarcoFalke

test/functional/test_framework/test_shell.py

@@ -16,6 +16,9 @@ class TestShell:
     start a single TestShell at a time."""
 
     class __TestShell(BitcoinTestFramework):
+        def add_options(self, parser):
+            self.add_wallet_options(parser)
+
         def set_test_params(self):
             pass