Fix missed H025 for double closing HTML tags

[MrkGrgsn]

I couldn't see any reason to keep orphaned closing tags in open_tags so store them separately to avoid accidental matches against subsequent closing tags.

Pull Request Check List

Resolves: #786

• [X] Added tests for changed code.
• [ ] Updated documentation for changed code.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (16b2319) 95.47% compared to head (cf52faf) 95.48%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #788 +/- ## ======================================= Coverage 95.47% 95.48% ======================================= Files 16 16 Lines 1061 1062 +1 Branches 283 283 ======================================= + Hits 1013 1014 +1 Misses 33 33 Partials 15 15 ```

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[christopherpickering]

@MrkGrgsn thanks for this!

[christopherpickering]

:tada: This PR is included in version 1.34.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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