整理代码习惯，常量字符串改用单引号，可能有遗漏

parts/modes/blind_u.lua

@@ -6,11 +6,11 @@ return{
 		drop=30,lock=60,
 		block=false,center=0,ghost=0,
 		dropFX=0,lockFX=0,
-		visible="none",
+		visible='none',
 		score=false,
-		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,
 		freshLimit=15,
-		bg="rgb",bgm="far",
+		bg='rgb',bgm='far',
 	},
 	pauseLimit=true,
 	load=function()