UI: Increased rendering resolution selection range to 10x on Windows

Since the range in the drop-down menu was increased to 10x in 46b022ac98d4fd5a411434c80652e9b35cf8ee09, it should be also 10x in here.
This commit fixes a small bug that resets the setting to 5x if the user has chosen resolution higher than 5x in the drop-down menu and then entered the settings menu.