Bring back css for the checkbox where it belongs

core/static/core/style.scss

@@ -76,6 +76,7 @@ button:not(:disabled),
 input[type="button"]:not(:disabled),
 input[type="submit"]:not(:disabled),
 input[type="reset"]:not(:disabled),
+input[type="checkbox"]:not(:disabled),
 input[type="file"]:not(:disabled) {
   cursor: pointer;
 }