Merge bitcoin/bitcoin#25915: test: Fix wallet_balance intermittent issue

fae5bd9 test: Fix wallet_balance intermittent issue (MacroFake)

Pull request description:

  Diff to reproduce:

  ```diff
  index d2ed97c..25cc2d5734 100755
  --- a/test/functional/wallet_balance.py
  +++ b/test/functional/wallet_balance.py
  @@ -265,7 +265,7 @@ class WalletTest(BitcoinTestFramework):
           self.nodes[0].invalidateblock(block_reorg)
           self.nodes[1].invalidateblock(block_reorg)
           assert_equal(self.nodes[0].getbalance(minconf=0), 0)  # wallet txs not in the mempool are untrusted
  -        self.generatetoaddress(self.nodes[0], 1, ADDRESS_WATCHONLY, sync_fun=self.no_op)
  +        self.generatetoaddress(self.nodes[0], 1, ADDRESS_WATCHONLY)
           assert_equal(self.nodes[0].getbalance(minconf=0), 0)  # wallet txs not in the mempool are untrusted

           # Now confirm tx_orig
  ```

  Example in CI:

  ```
   test  2022-08-24T10:09:22.486000Z TestFramework (ERROR): Assertion failed
                                     Traceback (most recent call last):
                                       File "/tmp/cirrus-ci-build/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_framework.py", line 133, in main
                                         self.run_test()
                                       File "/tmp/cirrus-ci-build/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/wallet_balance.py", line 269, in run_test
                                         assert_equal(self.nodes[0].getbalance(minconf=0), 0)  # wallet txs not in the mempool are untrusted
                                       File "/tmp/cirrus-ci-build/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/util.py", line 56, in assert_equal
                                         raise AssertionError("not(%s)" % " == ".join(str(arg) for arg in (thing1, thing2) + args))
                                     AssertionError: not(98.85983340 == 0)
  ```

  https://cirrus-ci.com/task/4981266251513856?logs=ci#L3269

ACKs for top commit:
  achow101:
    ACK fae5bd9
  w0xlt:
    ACK bitcoin/bitcoin@fae5bd9

Tree-SHA512: 470f366720615c4a9326ec4c581fff569ecce9877f9134bb1975ec3d6f1d13a6403051418a91a80b2a86de617f43e539ec11bbf4f1713d0354d5b0ab98d22437

Author: achow101

test/functional/wallet_balance.py

@@ -266,7 +266,6 @@ def test_balances(*, fee_node_1=0):
         self.nodes[1].invalidateblock(block_reorg)
         assert_equal(self.nodes[0].getbalance(minconf=0), 0)  # wallet txs not in the mempool are untrusted
         self.generatetoaddress(self.nodes[0], 1, ADDRESS_WATCHONLY, sync_fun=self.no_op)
-        assert_equal(self.nodes[0].getbalance(minconf=0), 0)  # wallet txs not in the mempool are untrusted
 
         # Now confirm tx_orig
         self.restart_node(1, ['-persistmempool=0'])