Fixups with Qt6 enums (#13611)

* Python PySide enums to C++ converter

* Python IntFlags to C++ int in getStandardButtons

* Remove int conversion in mods Python sources

src/Mod/Fem/femsolver/solver_taskpanel.py

@@ -156,7 +156,7 @@ class ControlTaskPanel(QtCore.QObject):
         femsolver.report.display(machine.report, _REPORT_TITLE, text)
 
     def getStandardButtons(self):
-        return int(QtGui.QDialogButtonBox.Close)
+        return QtGui.QDialogButtonBox.Close
 
     def reject(self):
         Gui.ActiveDocument.resetEdit()