Use RelAvatarLink() in GetActAvatar() (#2800)

models/action.go

@@ -141,7 +141,7 @@ func (a *Action) ShortActUserName() string {
 // GetActAvatar the action's user's avatar link
 func (a *Action) GetActAvatar() string {
 	a.loadActUser()
-	return a.ActUser.AvatarLink()
+	return a.ActUser.RelAvatarLink()
 }
 
 // GetRepoUserName returns the name of the action repository owner.