Fix oauth app update (#7913)

api4/oauth.go

@@ -100,7 +100,7 @@ func updateOAuthApp(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if c.Session.UserId != oauthApp.CreatorId && !c.App.SessionHasPermissionTo(c.Session, model.PERMISSION_MANAGE_SYSTEM_WIDE_OAUTH) {
+	if c.Session.UserId != oldOauthApp.CreatorId && !c.App.SessionHasPermissionTo(c.Session, model.PERMISSION_MANAGE_SYSTEM_WIDE_OAUTH) {
 		c.SetPermissionError(model.PERMISSION_MANAGE_SYSTEM_WIDE_OAUTH)
 		return
 	}