Fix overlapping text for not-in-group and announcement-only.

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

@@ -1673,7 +1673,7 @@ public class ConversationActivity extends PassphraseRequiredActivity
             throw new AssertionError();
         }
 
-        if (selfMembership.isAnnouncementGroup() && selfMembership.getMemberLevel() != GroupDatabase.MemberLevel.ADMINISTRATOR) {
+        if (!leftGroup && selfMembership.isAnnouncementGroup() && selfMembership.getMemberLevel() != GroupDatabase.MemberLevel.ADMINISTRATOR) {
           canSendMessages = false;
           cannotSendInAnnouncementGroupBanner.get().setVisibility(View.VISIBLE);
           cannotSendInAnnouncementGroupBanner.get().setMovementMethod(LinkMovementMethod.getInstance());