bugfix: change event to WindowBlocked for FancyDocking

Signed-off-by: Michael Pollind <mpollind@gmail.com>

Code/Framework/AzQtComponents/AzQtComponents/Components/FancyDocking.cpp

@@ -2785,7 +2785,7 @@ namespace AzQtComponents
                     RepaintFloatingIndicators();
                 }
                 break;
-            case QEvent::UngrabMouse:
+            case QEvent::WindowBlocked:
                 // If our main window is deactivated while we are in the middle of
                 // a docking drag operation (e.g. popup dialog for new level), we
                 // should cancel our drag operation because the mouse release event