simplify: remove children

stepmania/NoteSkins/common/common/Fallback Explosion.lua

@@ -1,5 +1,4 @@
 local t = Def.ActorFrame {
-	children = {
 	NOTESKIN:LoadActor( Var "Button", "Hold Explosion" ) .. {
 		HoldingOnCommand=NOTESKIN:GetMetricA("HoldGhostArrow", "HoldingOnCommand");
 		HoldingOffCommand=NOTESKIN:GetMetricA("HoldGhostArrow", "HoldingOffCommand");
@@ -34,5 +33,4 @@ local t = Def.ActorFrame {
 		HitMineCommand=NOTESKIN:GetMetricA("GhostArrowBright", "HitMineCommand");
 	};
 }
-}
 return t;

stepmania/NoteSkins/common/common/_Tap Lead-in Receptor.lua

@@ -1,5 +1,4 @@
 return Def.ActorFrame {
-	children = {
 	LoadActor( "_Tap Receptor", NOTESKIN:LoadActor(Var "Button", "Ready Receptor") ) .. {
 		Frame0000=2;
 		Delay0000=1;
@@ -22,4 +21,3 @@ return Def.ActorFrame {
 		SetCommand=cmd(visible,not GAMESTATE:GetGameplayLeadIn());
 	};
 }
-}