fixed delete mass message api. msgid to msg_id
fixed delete mass message api. msgid to msg_id

tsdl2013/wechat-api,guanbo/wechat-api,tedyyu/wechat-api,flybird119/wechat-api,liuxiaodong/wechat-api,15921050052/wechat-api,node-webot/wechat-api