Fix duplicate code

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (dc15506) 100.00% compared to head (2047c9a) 100.00%.

:exclamation: Current head 2047c9a differs from pull request most recent head c7542e2. Consider uploading reports for the commit c7542e2 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #100 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 259 260 +1 Lines 7481 7481 ========================================= Hits 7481 7481 ``` | [Files Changed](https://app.codecov.io/gh/phug-php/phug/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=phug-php) | Coverage Δ | | |---|---|---| | [src/Phug/Lexer/Lexer/Scanner/FilterScanner.php](https://app.codecov.io/gh/phug-php/phug/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=phug-php#diff-c3JjL1BodWcvTGV4ZXIvTGV4ZXIvU2Nhbm5lci9GaWx0ZXJTY2FubmVyLnBocA==) | `100.00% <100.00%> (ø)` | | | [src/Phug/Lexer/Lexer/Scanner/MultilineScanner.php](https://app.codecov.io/gh/phug-php/phug/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=phug-php#diff-c3JjL1BodWcvTGV4ZXIvTGV4ZXIvU2Nhbm5lci9NdWx0aWxpbmVTY2FubmVyLnBocA==) | `100.00% <100.00%> (ø)` | | | [...er/Scanner/Partial/TrailingOutdentHandlerTrait.php](https://app.codecov.io/gh/phug-php/phug/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=phug-php#diff-c3JjL1BodWcvTGV4ZXIvTGV4ZXIvU2Nhbm5lci9QYXJ0aWFsL1RyYWlsaW5nT3V0ZGVudEhhbmRsZXJUcmFpdC5waHA=) | `100.00% <100.00%> (ø)` | |

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