Only sync V1 groups with linked devices.

app/src/main/java/org/thoughtcrime/securesms/database/GroupDatabase.java

@@ -693,6 +693,10 @@ public final class GroupDatabase extends Database {
       return mms;
     }
 
+    public boolean isV1Group() {
+      return !mms && !isV2Group();
+    }
+
     public boolean isV2Group() {
       return v2GroupProperties != null;
     }

app/src/main/java/org/thoughtcrime/securesms/jobs/MultiDeviceGroupUpdateJob.java

@@ -85,7 +85,7 @@ public class MultiDeviceGroupUpdateJob extends BaseJob {
       reader = DatabaseFactory.getGroupDatabase(context).getGroups();
 
       while ((record = reader.getNext()) != null) {
-        if (!record.isMms()) {
+        if (record.isV1Group()) {
           List<SignalServiceAddress> members = new LinkedList<>();
 
           for (RecipientId member : record.getMembers()) {