fix(ui): use nextcloud/vue formatRelativeTime in mixin

Signed-off-by: grnd-alt <git@belakkaf.net>

Author: grnd-alt

src/mixins/relativeDate.js

@@ -4,16 +4,13 @@
  */
 
 import moment from '@nextcloud/moment'
+import { useFormatRelativeTime } from '@nextcloud/vue'
 
 export default {
 	computed: {
 		relativeDate() {
 			return (timestamp) => {
-				const diff = moment(this.$root.time).diff(moment(timestamp))
-				if (diff >= 0 && diff < 45000) {
-					return t('core', 'seconds ago')
-				}
-				return moment(timestamp).fromNow()
+				return useFormatRelativeTime(timestamp)
 			}
 		},
 	},