chore(web): use web auth factory directly

(cherry picked from commit 9b01666ec6c41f5487cfc6c381b3937f1fe53a16)

pkg/web/handler/update.go

@@ -22,6 +22,7 @@ import (
 	"net/http"
 
 	"code.vikunja.io/api/pkg/db"
+	"code.vikunja.io/api/pkg/modules/auth"
 
 	"github.com/labstack/echo/v4"
 )
@@ -48,7 +49,7 @@ func (c *WebHandler) UpdateWeb(ctx echo.Context) error {
 	}
 
 	// Check if the user has the right to do that
-	currentAuth, err := config.AuthProvider.AuthObject(ctx)
+	currentAuth, err := auth.GetAuthFromClaims(ctx)
 	if err != nil {
 		return echo.NewHTTPError(http.StatusInternalServerError, "Could not determine the current user.")
 	}