QDnsLookup: add the TLSA records to allAreEmpty()

This is only used in Q_ASSERT(), so no big deal.

Change-Id: Ie30a3caf09ef4176bb36fffd17cdebefeff5cf34
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/network/kernel/qdnslookup_p.h

@@ -131,6 +131,7 @@ private:
                 && nameServerRecords.isEmpty()
                 && pointerRecords.isEmpty()
                 && serviceRecords.isEmpty()
+                && tlsAssociationRecords.isEmpty()
                 && textRecords.isEmpty();
     }
 };