整理代码习惯，常量字符串改用单引号，可能有遗漏

parts/modes/drought_n.lua

@@ -3,13 +3,13 @@ return{
 	color=COLOR.green,
 	env={
 		drop=20,lock=60,
-		sequence="bag",
+		sequence='bag',
 		seqData={1,1,2,2,3,3,4,4,5,5,6,6},
-		dropPiece=function(P)if P.stat.row>=100 then P:win("finish")end end,
+		dropPiece=function(P)if P.stat.row>=100 then P:win('finish')end end,
 		nextCount=3,
 		ospin=false,
 		freshLimit=15,
-		bg="blockfall",bgm="reason",
+		bg='blockfall',bgm='reason',
 	},
 	pauseLimit=true,
 	load=function()