Revert "Prevent a deadlock condition in Deskbar. Fixes #8539"

This reverts commit 733be65954.

It didn't fix the bug, will try again.

src/apps/deskbar/ExpandoMenuBar.cpp

@@ -195,14 +195,6 @@ TExpandoMenuBar::DetachedFromWindow()
 	if (sMonThread != B_ERROR) {
 		sDoMonitor = false;
 
-		if (Window()->IsLocked()) {
-			// If window is locked by the menu_tracking thread kill it
-			// to prevent a deadlock. See ticket #8539.
-			thread_id menu_tracking = find_thread("menu_tracking");
-			if (menu_tracking != B_NAME_NOT_FOUND)
-				kill_thread(menu_tracking);
-		}
-
 		status_t returnCode;
 		wait_for_thread(sMonThread, &returnCode);