Fixed DetachCurrentMessage():

* the current message is not part of the queue when it's dispatched, so it
  doesn't make any sense to try to remove it.
* it's only to be called during message processing - and at that time, the
  looper is locked, anyway.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15079 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/app/Looper.cpp

@@ -321,11 +321,8 @@ BLooper::CurrentMessage() const
 BMessage*
 BLooper::DetachCurrentMessage()
 {
-	Lock();
 	BMessage* msg = fLastMessage;
 	fLastMessage = NULL;
-	fQueue->RemoveMessage(msg);
-	Unlock();
 	return msg;
 }