Remove screenshots from build

.drone.yml

@@ -28,7 +28,7 @@ steps:
     - apk update && apk add --no-cache zip
     # Delete unneeded files/dirs
     - rm -rf sources/.git
-    - rm -rf screenshots
+    - rm -rf sources/screenshots
     - rm -f sources/.drone.status
     - rm -f sources/.drone.yml
     - rm -f sources/.luacheckrc