spin判定代码调整

parts/player.lua

@@ -2083,20 +2083,12 @@ do--player.drop(P)--Place piece
 		end
 
 		--Final spin check
-		if P.spinLast then
-			if cc>0 then
 		if dospin>0 then
-					dospin=dospin+P.spinLast
+			if cc>0 then
+				dospin=dospin+(P.spinLast or 0)
 				if dospin<2 then
 					mini=CB.id<6 and cc<3 and cc<P.r
 				end
-				else
-					dospin=false
-				end
-			elseif cc==0 then
-				if dospin==0 then
-					dospin=false
-				end
 			end
 		else
 			dospin=false