fix: also run phpunit on `apps/theming/css` modified files

Signed-off-by: John Molakvoæ <skjnldsv@protonmail.com>

tests/drone-run-php-tests.sh

@@ -24,4 +24,6 @@ echo "========================="
 
 [[ $(git diff --name-only origin/$DRONE_TARGET_BRANCH...$DRONE_COMMIT_SHA | grep -c "3rdparty") -gt 0 ]] && echo "3rdparty is modified" && exit 0
 
+[[ $(git diff --name-only origin/$DRONE_TARGET_BRANCH...$DRONE_COMMIT_SHA | grep -c "apps/theming/css") -gt 0 ]] && echo "theming css is modified" && exit 0
+
 exit 1