fix: kanban-card mutatation violation (#712)

Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Reviewed-on: vikunja/frontend#712
Reviewed-by: konrad <k@knt.li>
Co-authored-by: dpschen <dpschen@noreply.kolaente.de>
Co-committed-by: dpschen <dpschen@noreply.kolaente.de>

src/components/tasks/partials/kanban-card.vue

@@ -92,8 +92,10 @@ export default {
 	methods: {
 		markTaskAsDone(task) {
 			this.loadingInternal = true
-			task.done = !task.done
-			this.$store.dispatch('tasks/update', task)
+			this.$store.dispatch('tasks/update', {
+				...task,
+				done: !task.done,
+			})
 				.then(() => {
 					if (task.done) {
 						playPop()