Allowing joining group calls in announcement groups.

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationActivity.java

@@ -1430,7 +1430,7 @@ public class ConversationActivity extends PassphraseRequiredActivity
   private void handleVideo(final Recipient recipient) {
     if (recipient == null) return;
 
-    if (recipient.isPushV2Group() && groupViewModel.isNonAdminInAnnouncementGroup()) {
+    if (recipient.isPushV2Group() && groupCallViewModel.hasActiveGroupCall().getValue() == Boolean.FALSE && groupViewModel.isNonAdminInAnnouncementGroup()) {
       new MaterialAlertDialogBuilder(this).setTitle(R.string.ConversationActivity_cant_start_group_call)
                                           .setMessage(R.string.ConversationActivity_only_admins_of_this_group_can_start_a_call)
                                           .setPositiveButton(android.R.string.ok, (d, w) -> d.dismiss())