stop writing debug files from the diff matcher test helper

assert_equal_enough wrote its inputs to files named "token" and "rev"
in the current directory on every invocation, littering the repository
root whenever the test suite ran.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
(cherry picked from commit 45f0680200)

test/test_wiki_diff_matcher.py

@@ -21,8 +21,6 @@ def assert_equal_enough(tokens:List[Token], rev):
     # the tokens exclude newlines
     # we allow extra whitespace at the beginning or end
     token_doc = ''.join(str(t) for t in tokens)
-    print(token_doc, file = open('token','w'))
-    print(rev, file = open('rev','w'))
     token_doc = re.sub(r'( +)|(\n+)|(\t+)', _replace_whitespace, token_doc).strip()
     rev = re.sub(r'( +)|(\n+)|(\t+)', _replace_whitespace, rev).strip()
     assert token_doc == rev