MelonbooksResolver: ページタイトル内の丸括弧が半角化されたことに伴う抽出正規表現の修正

[shibafu528]

fix #1264

[codecov[bot]]

Codecov Report

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

Project coverage is 41.57%. Comparing base (cb2a76d) to head (de6a1bd). Report is 2 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1265 +/- ## ========================================== Coverage 41.57% 41.57% Complexity 1005 1005 ========================================== Files 127 127 Lines 3680 3680 ========================================== Hits 1530 1530 Misses 2150 2150 ```

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