Update Qt.py

Fix for really old versions of PySide2

Author: mottosso

Qt.py

@@ -966,6 +966,10 @@ def createWidget(self, class_name, parent=None, name=""):
     },
     "PySide2": {
         "QtCore.QStringListModel": "QtCore.QStringListModel",
+
+        # Older versions of PySide2 still left this in QtGui, this accounts for those too
+        "QtGui.QStringListModel": "QtCore.QStringListModel",
+
         "QtCore.Property": "QtCore.Property",
         "QtCore.Signal": "QtCore.Signal",
         "QtCore.Slot": "QtCore.Slot",