CR: use existing transaction rather than open sneaky one

SignalServiceKit/src/Messages/OWSDisappearingMessagesJob.m

@@ -215,7 +215,8 @@ void AssertIsOnDisappearingMessagesQueue()
 
     NSString *_Nullable remoteContactName = nil;
     if (remoteRecipientId) {
-        remoteContactName = [self.contactsManager displayNameForPhoneIdentifier:remoteRecipientId];
+        remoteContactName = [self.contactsManager displayNameForPhoneIdentifier:remoteRecipientId
+                                                                    transaction:transaction];
     }
 
     // Become eventually consistent in the case that the remote changed their settings at the same time.