fix 修复watch更新数据库时，没指定uid的bug

pkg/watcher/coach.go

@@ -86,7 +86,7 @@ func (c *CoachOutlet) Restart() {
 }
 func (c *CoachOutlet) Watch() {
 	c.ctx, c.cancel = context.WithCancel(c.fCtx)
-	if err := c.db.Model(&model.Product{}).Updates(map[string]interface{}{"watch": true, "orderable": false}).Error; err != nil {
+	if err := c.db.Model(&model.Product{}).Where("uid", c.Uid()).Updates(map[string]interface{}{"watch": true, "orderable": false}).Error; err != nil {
 		glog.Errorf("watch update db err: %v", err)
 		err = nil
 	}