lib/model: Allow limiting number of concurrent scans (fixes #2760) (#4888)

gui/default/syncthing/core/syncthingController.js

@@ -769,7 +769,7 @@ angular.module('syncthing.core')
             if (status === 'stopped' || status === 'outofsync' || status === 'error') {
                 return 'danger';
             }
-            if (status === 'unshared') {
+            if (status === 'unshared' || status === 'scan-waiting') {
                 return 'warning';
             }