Don't print safety number changes in inactive groups

Fixes #5930
// FREEBIE

src/org/thoughtcrime/securesms/jobs/IdentityUpdateJob.java

@@ -42,7 +42,7 @@ public class IdentityUpdateJob extends MasterSecretJob {
     GroupDatabase.GroupRecord groupRecord;
 
     while ((groupRecord = reader.getNext()) != null) {
-      if (groupRecord.getMembers().contains(number)) {
+      if (groupRecord.getMembers().contains(number) && groupRecord.isActive()) {
         SignalServiceGroup            group       = new SignalServiceGroup(groupRecord.getId());
         IncomingTextMessage           incoming    = new IncomingTextMessage(number, 1, time, null, Optional.of(group), 0);
         IncomingIdentityUpdateMessage groupUpdate = new IncomingIdentityUpdateMessage(incoming);