整理master_ex代码，修复结束前分数上限错误

parts/modes/master_extra.lua

@@ -1,11 +1,11 @@
 local sectionName={"D","C","B","A","A+","S-","S","S+","SS","SS","SS","U","U","U","X"}
 local function score(P)
-	--If Less then MM
+	--If Less then X
 	if P.modeData.rankScore<130 then
 		local R=#P.clearedRow
 		if R>0 then
 			if R==4 then R=10 end--Techrash bonus
-			P.modeData.rankScore=math.min(P.modeData.rankScore+R,120)
+			P.modeData.rankScore=math.min(P.modeData.rankScore+R,130)
 			P.modeData.rankName=sectionName[math.floor(P.modeData.rankScore/10)+1]
 		end
 	end
@@ -56,6 +56,12 @@ return{
 	comp=function(a,b)return a[1]>b[1]or a[1]==b[1]and a[2]>b[2]end,
 	getRank=function(P)
 		P=P.modeData.rankScore
-		return P==140 and 5 or P>=110 and 4 or P>=80 and 3 or P>=50 and 2 or P>=30 and 1 or P>=10 and 0
+		return
+			P==140 and 5 or
+			P>=110 and 4 or
+			P>=80 and 3 or
+			P>=50 and 2 or
+			P>=30 and 1 or
+			P>=10 and 0
 	end,
 }