qt-cli: Bug fix on Python project template

Fixed wrong class name and import name generation.

Task-number: [VSCODEEXT-239](https://bugreports.qt.io/browse/VSCODEEXT-239)

Author: benchoq

qt-cli/src/assets/templates/projects/python/qwidget/main.py

@@ -6,7 +6,7 @@
 # Important:
 # You need to run the following command to generate the ui_form.py file
 #     pyside6-uic form.ui -o ui_form.py
-from ui_form import Ui_Widget
+from ui_form import Ui_{{ .className }}
 {{- end }}
 
 
@@ -15,13 +15,13 @@ def __init__(self, parent=None):
         super().__init__(parent)
 
 {{- if .useForm }}
-        self.ui = Ui_Widget()
+        self.ui = Ui_{{ .className }}()
         self.ui.setupUi(self)
 {{- end }}
 
 
 if __name__ == "__main__":
     app = QApplication(sys.argv)
-    widget = Widget()
+    widget = {{ .className }}()
     widget.show()
     sys.exit(app.exec())