change(apps): config tab is now default for app plugins, fixes #4573

public/app/features/plugins/plugin_edit_ctrl.ts

@@ -47,6 +47,7 @@ export class PluginEditCtrl {
       });
 
       if (this.model.type === 'app') {
+        this.tabIndex = 1;
         this.tabs.push('Config');
 
         this.hasDashboards = _.findWhere(result.includes, {type: 'dashboard'});