removed extra semi-colon

packages/grafana-ui/src/components/PanelOptionsGroup/_PanelOptionsGroup.scss

@@ -29,7 +29,7 @@
 
   &:hover {
     .panel-options-group__add-circle {
-      background-color: $btn-primary-bg;;
+      background-color: $btn-primary-bg;
       color: $white;
     }
   }