Remove useless static

Signed-off-by: Mario Danic <mario@lovelyhq.com>

app/src/main/java/com/nextcloud/talk/controllers/WebViewLoginController.java

@@ -117,7 +117,7 @@ public class WebViewLoginController extends BaseController {
         super(args);
     }
 
-    private static String getWebLoginUserAgent() {
+    private String getWebLoginUserAgent() {
         return Build.MANUFACTURER.substring(0, 1).toUpperCase(Locale.getDefault()) +
                 Build.MANUFACTURER.substring(1).toLowerCase(Locale.getDefault()) + " " + Build.MODEL;
     }