Remove file name exceptions (#7249)

CI/check_file_names.sh

@@ -1,7 +1,6 @@
 #!/bin/bash -ex
 
 git ls-files -- ':(exclude)extern/' '*.cpp' '*.hpp' '*.h' |
-    grep -vP '/[a-z0-9]+\.(cpp|hpp|h)$' |
-    grep -vFf CI/file_name_exceptions.txt &&
+    grep -vP '/[a-z0-9]+\.(cpp|hpp|h)$' &&
     ( echo 'File names do not follow the naming convention, see https://wiki.openmw.org/index.php?title=Naming_Conventions#Files'; exit -1 )
 exit 0