整理代码习惯，常量字符串改用单引号，可能有遗漏

parts/modes/infinite_dig.lua

@@ -3,9 +3,9 @@ local function check_rise(P)
 	if #P.clearedRow==0 then
 		if L>0 then
 			if L<3 then
-				P:showTextF(text.almost,0,-120,80,"beat",.8)
+				P:showTextF(text.almost,0,-120,80,'beat',.8)
 			elseif L<5 then
-				P:showTextF(text.great,0,-120,80,"fly",.8)
+				P:showTextF(text.great,0,-120,80,'fly',.8)
 			end
 		end
 		for _=1,8-L do
@@ -13,8 +13,8 @@ local function check_rise(P)
 		end
 	else
 		if L==0 then
-			P:showTextF(text.awesome,0,-120,80,"beat",.6)
-			SFX.play("clear")
+			P:showTextF(text.awesome,0,-120,80,'beat',.6)
+			SFX.play('clear')
 			BG.send(26)
 			for _=1,8 do
 				P:garbageRise(13,1,generateLine(P:RND(10)))
@@ -32,7 +32,7 @@ return{
 		infHold=true,
 		dropPiece=check_rise,
 		pushSpeed=1.2,
-		bg="wing",bgm="dream",
+		bg='wing',bgm='dream',
 	},
 	load=function()
 		PLY.newPlayer(1)