minor #4753 Do not apply any text/.git filters to fixtures (mvorisek)

This PR was merged into the 2.15 branch.

Discussion
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Do not apply any text/.git filters to fixtures

Fix CS, important as many editors add the final EOL and change EOL to `\n` on save and it is very hard to work with the current text files.

Commits
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2e427d01 Do not apply any text/.git filters to fixtures

.gitattributes

@@ -23,4 +23,4 @@
 *.php   text whitespace=blank-at-eol,blank-at-eof,space-before-tab,tab-in-indent,tabwidth=4 diff=php
 *.rst   text whitespace=blank-at-eol,blank-at-eof
 *.yml   text whitespace=blank-at-eol,blank-at-eof,space-before-tab,tab-in-indent,tabwidth=4
-/tests/Fixtures/**/* -text
+/tests/Fixtures/**/* -text -filter