fix: setting background to state mutation violation (#858)

State mutations must be synchronous. Using a promise.then handler to set the background is a violation of that.

Co-authored-by: kolaente <k@knt.li>
Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/858
Co-authored-by: konrad <k@knt.li>
Co-committed-by: konrad <k@knt.li>

src/views/list/ShowList.vue

@@ -141,7 +141,7 @@ export default {
 			const list = new ListModel(listData)
 			this.listService.get(list)
 				.then(r => {
-					this.$store.commit(CURRENT_LIST, r)
+					this.$store.dispatch(CURRENT_LIST, r)
 					this.setTitle(this.getListTitle(r))
 				})
 				.catch(e => {