Merge branch 'fix-announcement-banner-only-mac-app' into 'master'

Fix: Annoucement banner only for mac app

See merge request kchat/webapp!800

webapp/channels/src/components/announcement_bar/appstore_announcement_bar/appstore_announcement_bar.tsx

@@ -23,6 +23,14 @@ export default class AppStoreBar extends React.PureComponent<Props> {
         const latestVer = latestVersion || '';
         const userAgentVersion = UserAgent.getDesktopVersion();
 
+        if (!UserAgent.isMacApp()) {
+            return null;
+        }
+
+        if (UserAgent.isNotMacMas()) {
+            return null;
+        }
+
         if (!latestVer || !userAgentVersion) {
             return null;
         }