minor #17480 Static code analysis (Koc)
minor #17480 Static code analysis (Koc)

This PR was merged into the 2.3 branch.

Discussion
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Static code analysis

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Things that done:
* fix case in method calls
* removed unused imports
* use shorter concat where it possible
* optimize some css
* removed duplicated array keys
* removed redurant return statements
* removed one-time variables
* do not pass arguments that not used in functions

Commits
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8db691a Static code analysis

symfony/Finder