Remove locking from TrackerSettingsWindow::QuitRequested()

Like Deskbar it isn't needed here either since the window is already
locked. The return value seems to be totally ignored, so, just leave
as is.

src/kits/tracker/TrackerSettingsWindow.cpp

@@ -135,19 +135,10 @@ TrackerSettingsWindow::TrackerSettingsWindow()
 bool
 TrackerSettingsWindow::QuitRequested()
 {
-	bool isHidden = false;
-
-	if (Lock()) {
-		isHidden = IsHidden();
-		Unlock();
-	} else
-		return true;
-
-	if (isHidden)
+	if (IsHidden())
 		return true;
 
 	Hide();
-
 	return false;
 }