Fix scale on 4k

[StranikS-Scan]

Replace the code to take into account interface scaling in 4k mode:

    def resize(self):
        if self.ui is not None:
            width, height = GUI.screenResolution()
            scale = ServicesLocator.settingsCore.interfaceScale.get()
            self.ui.as_resizeS(int(width / float(scale)), int(height / float(scale)))

[CH4MPi]

Fix included, thanks.

https://github.com/CH4MPi/GUIFlash/releases/tag/v0.6.4

[CH4MPi]

@StranikS-Scan : I got several reports about wrong positioning of guiflash elements on 4k screens. Also players are unable to move (drag) the element to any position on the screen in window mode. I wasn't able to look into it yet but It seems that the dragging stuff need some fixes too when the fix is included.

[CH4MPi]

a player reported that he can't move the element lower as the red box and its normally placed in the blue box.
It works in 4k fullscreen but not in window mode.