Change QColorDialog from native and make modal

With native could risk that QColorDialog was behind
the color dialog, made it hard to select color

Author: eilskra

src/ert/gui/plotting/customization_dialog/color_chooser.py

@@ -35,9 +35,11 @@ def show_color_dialog(self) -> None:
         color_dialog = QColorDialog(self._color, self)
         color_dialog.setWindowTitle("Select color")
         color_dialog.setOption(QColorDialog.ColorDialogOption.ShowAlphaChannel)
+        color_dialog.setOption(QColorDialog.ColorDialogOption.DontUseNativeDialog)
         color_dialog.accepted.connect(
             lambda: self.colorChanged.emit(color_dialog.selectedColor())
         )
+        color_dialog.setModal(True)
         color_dialog.open()
 
     @property