Fix theming issues

lib/ui/widgets/tablet_mode/memberships_panel.dart

@@ -171,8 +171,7 @@ class _MembershipsPanelState extends SafeState<MembershipsPanel> {
     try {
       if (!accept &&
           !await showConfirmDialog(
-              context: Scaffold.of(context)
-                  .context, // Without this the text appears in white
+              context: context,
               message:
                   tr("Do you really want to reject this friendship request?")))
         return;