auth: Make apple log in and sign up buttons consistent with others.

tools/linter_lib/custom_check.py

@@ -499,8 +499,6 @@ html_rules: List["Rule"] = whitespace_rules + prose_style_rules + [
      'good_lines': ['<input class="stream-list-filter" type="text" placeholder="{{ _(\'Search streams\') }}" />'],
      'bad_lines': ['<input placeholder="foo">']},
     {'pattern': '={',
-     # TODO: Improve the Apple auth patterns so we can remove this.
-     'exclude_pattern': 'appleid.cdn-apple.com/appleid/button',
      'description': "Likely missing quoting in HTML attribute",
      'good_lines': ['<a href="{{variable}}">'],
      'bad_lines': ['<a href={{variable}}>']},