fix wx_user inner_no

go/gopath/src/fohow.com/apps/models/user_model/three_wx_user.go

@@ -191,7 +191,7 @@ func NewAvailableIntroArea(wxUserId, inviteRank int64) (string, string) {
 		SELECT
 			intro_area 
 		FROM
-			wx_users
+			three_wx_users
 		WHERE
 			invite_id = ?
 		AND