fixup! DX: Check trailing spaces in project files only

lets not loose colors and pass on the rainbow flag.

find prefixes "./"; git ls-files does not.

check_trailing_spaces.sh

@@ -12,7 +12,7 @@ if [ "$files_with_trailing_spaces" ]
 then
     printf '\033[97;41mTrailing whitespaces detected:\033[0m\n'
     e=$(printf '\033')
-    echo "${files_with_trailing_spaces}" | sed -E "s/^\\.\\/([^:]+):([0-9]+):(.*[^\\t ])?([\\t ]+)$/${e}[0;31m - in ${e}[0;33m\\1${e}[0;31m at line ${e}[0;33m\\2\\n   ${e}[0;31m>${e}[0m \\3${e}[41;1m\\4${e}[0m/"
+    echo "${files_with_trailing_spaces}" | sed -E "s/^([^:]+):([0-9]+):(.*[^\\t ])?([\\t ]+)$/${e}[0;31m - in ${e}[0;33m\\1${e}[0;31m at line ${e}[0;33m\\2\\n   ${e}[0;31m>${e}[0m \\3${e}[41;1m\\4${e}[0m/"
 
     exit 3
 fi