Minor fixes based on lgtm.com alerts (#6819)

* Remove a couple of superfluous trailing arguments

* Simplify assignment logic in a couple of places

* Modify some potentially inconsistent setState calls to use the function form

* Fix eslint errors

webapp/components/admin_console/manage_teams_modal/manage_teams_dropdown.jsx

@@ -38,8 +38,8 @@ export default class ManageTeamsDropdown extends React.Component {
     }
 
     toggleDropdown() {
-        this.setState({
-            show: !this.state.show
+        this.setState((prevState) => {
+            return {show: !prevState.show};
         });
     }
 

webapp/components/admin_console/push_settings.jsx

@@ -79,8 +79,6 @@ export default class PushSettings extends AdminSettings {
             agree = true;
         } else if (config.EmailSettings.PushNotificationServer === Constants.MTPNS) {
             pushNotificationServerType = PUSH_NOTIFICATIONS_MTPNS;
-        } else {
-            pushNotificationServerType = PUSH_NOTIFICATIONS_CUSTOM;
         }
 
         let pushNotificationServer = config.EmailSettings.PushNotificationServer;