ci: fix format task

.ci/scripts/format/script.sh

@@ -5,8 +5,7 @@
 
 shopt -s nullglob globstar
 
-if grep -nrI '\s$' src **/*.yml **/*.txt **/*.md Doxyfile .gitignore .gitmodules .ci* dist/*.desktop \
-                 dist/*.svg dist/*.xml; then
+if git grep -nrI '\s$' src **/*.yml **/*.txt **/*.md Doxyfile .gitignore .gitmodules .ci* dist/*.desktop dist/*.svg dist/*.xml; then
     echo Trailing whitespace found, aborting
     exit 1
 fi