scripted-diff: replace remaining Python test equality asserts

Some Python functional tests still use plain `assert x == y`.
The earlier commits convert the ambiguous assert patterns by hand, so this commit can rewrite the remaining safe cases mechanically.
The verify script excludes `wallet_bumpfee.py`, `test_framework/netutil.py`, and `test_framework/authproxy.py`, which still contain assert forms that the plain line-based substitution would misidentify.

-BEGIN VERIFY SCRIPT-
perl -pi -e 's/^(\s*)assert (.+?) == ([^,#]+?)$/\1assert_equal(\2, \3)/' $(git ls-files -- 'test/functional' \
':(exclude)test/functional/wallet_bumpfee.py' ':(exclude)test/functional/test_framework/netutil.py' ':(exclude)test/functional/test_framework/authproxy.py')
-END VERIFY SCRIPT-

test/functional/tool_wallet.py

@@ -93,7 +93,7 @@ class ToolWalletTest(BitcoinTestFramework):
     def assert_is_sqlite(self, filename):
         with open(filename, 'rb') as f:
             file_magic = f.read(16)
-            assert file_magic == b'SQLite format 3\x00'
+            assert_equal(file_magic, b'SQLite format 3\x00')
 
     def write_dump(self, dump, filename, magic=None, skip_checksum=False):
         if magic is None: