整理代码习惯，常量字符串改用单引号，可能有遗漏

parts/modes/round_u.lua

@@ -18,17 +18,17 @@ return{
 		dropPiece=update_round,
 		pushSpeed=15,
 		garbageSpeed=1e99,
-		bg="rainbow",bgm="push",
+		bg='rainbow',bgm='push',
 	},
 	load=function()
 		PLY.newPlayer(1)
-		PLY.newAIPlayer(2,AIBUILDER("CC",7,3,true,40000))
+		PLY.newAIPlayer(2,AIBUILDER('CC',7,3,true,40000))
 	end,
 	score=function(P)return{P.stat.piece,P.stat.time}end,
 	scoreDisp=function(D)return D[1].." Pieces   "..STRING.time(D[2])end,
 	comp=function(a,b)return a[1]<b[1]or a[1]==b[1]and a[2]<b[2]end,
 	getRank=function(P)
-		if P.result=="WIN"then
+		if P.result=='win'then
 			local T=P.stat.piece
 			return
 			T<=30 and 5 or