Fix editor yellow syndrome, remove EditModifiers metric

Themes/_fallback/metrics.ini

@@ -3822,7 +3822,7 @@ ShowCreditDisplay=false
 ShowStyleIcon=false
 InvertScrollSpeedButtons=false
 TimerSeconds=-1
-EditModifiers="no reverse"
+EditModifiers=""
 EditHelpX=SCREEN_LEFT+4
 EditHelpY=SCREEN_TOP+16
 EditHelpOnCommand=halign,0;valign,0;zoom,0.5;shadowlength,1

Themes/default/BGAnimations/ScreenEdit background.lua

@@ -3,10 +3,6 @@ local t = Def.ActorFrame {
 };
 t[#t+1] = Def.ActorFrame {
   InitCommand=cmd(Center);
-	Def.Quad {
-		InitCommand=cmd(scaletoclipped,SCREEN_WIDTH,SCREEN_HEIGHT);
-		OnCommand=cmd(diffuse,color("#ffcb05"));
-	};
 	LoadActor( THEME:GetPathB("ScreenWithMenuElements","background/_bg top") ) .. {
 		InitCommand=cmd(scaletoclipped,SCREEN_WIDTH,SCREEN_HEIGHT);
 	};