Update drowl_admin.module, drowl_admin.libraries.yml files

Deleted scss/drowl_admin.debug_fixes.scss, css/drowl_admin.debug_fixes.min.css files

Closes #3220546

added 3 commits

• 1206fca0...08b8944a - 2 commits from branch project:2.x
• 746fbc72 - Update drowl_admin.module, drowl_admin.libraries.yml files

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