Fix coding style

ressarequested to merge
issue/photoswipe-3620906:3620906-fix-code-style into 5.x
  • /README.md
  • /modules/photoswipe_dynamic_caption/photoswipe_dynamic_caption.module
  • /modules/photoswipe_dynamic_caption/photoswipe_dynamic_caption.install
  • /tests/src/FunctionalJavascript/ImageFileTest.php

Closes #3620906

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