FIX the position setting of CCTMXLayer

Author: xmkevinchen

cocos2d-ext/TileMaps/CCTiledMapLayer.m

@@ -101,7 +101,7 @@ -(id) initWithTilesetInfo:(CCTiledMapTilesetInfo*)tilesetInfo layerInfo:(CCTiled
 
 		// offset (after layer orientation is set);
 		CGPoint offset = [self calculateLayerOffset:layerInfo.offset];
-		[self setPosition:ccpMult(offset, pixelsToPoints)];
+		[self setPosition:offset];
 
 		[self setContentSize:CGSizeMake( _mapColumns * _tileWidth, _mapRows * _tileHeight)];