Recognize custom art wen using groups. it stays with art of 2nd menu, doesnt update for 3rd

[RFSVIEIRA]

Issue description

Wen using groups inside es_system, it will have more than 2 menus... 1st - system, 2nd group menu, 3rd gamelist menu, but ES only recognizes for custom art 2 menu´s, --- system and gamelist--
ex. of background but cold be a character

	<image name="system-background" extra="true">
        <origin>0 0</origin>
        <pos>0 0</pos>
        <size>1 1</size> 
		<path>./_art/systems/${system.theme}/bkg.png</path> 
        <zIndex>1</zIndex> 
 </image>

using that code ex. in carrousel it will show image wen open ex. AMIGA (group) but wen enter amiga500, our amiga1200 etc.. will stay with the custom art of the group AMIGA. needs somethink to force update the art of the gamelist, our option of the group stays inside the system not in the gamelist, our option to manage more than 2 menus. (grouplist, extraList1, extraList2) Thanks