Fix timestamp not set on clearing instance saves

Set the save's updatedAtMs timestamp when clearing the save list of a
reassigned or deleted instance.  This fixes the Web UI not updating the
saves list to remove the saves when an instance is reassigned.

packages/controller/src/Controller.ts

@@ -876,9 +876,11 @@ export default class Controller {
 	 */
 	clearSavesOfInstance(instanceId: number) {
 		const updates = [];
+		const now = Date.now();
 		for (const [id, save] of this.saves) {
 			if (save.instanceId === instanceId) {
 				save.isDeleted = true;
+				save.updatedAtMs = now;
 				updates.push(save);
 				this.saves.delete(id);
 			}