do not update modal route unless a change

src/Umbraco.Web.UI.Client/src/packages/core/modal/modal-route-registration.controller.ts

@@ -108,6 +108,9 @@ export class UmbModalRouteRegistrationController<D extends object = object, R =
 				`Identifier ${identifier} was not registered at the construction of the modal registration controller, it has to be.`
 			);
 		}
+		const oldValue = this.#uniquePaths.get(identifier);
+		if(oldValue === value) return;
+
 		this.#uniquePaths.set(identifier, value);
 		this.#registerModal();
 	}