chore: undefined vs null

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

core/src/views/Profile.vue

@@ -69,7 +69,7 @@
 								:href="primaryAction.target"
 								:icon="primaryAction.icon"
 								:target="primaryAction.id === 'phone' ? '_self' :'_blank'"
-								:rel="primaryAction.id === 'fediverse' ? 'me': null">
+								:rel="primaryAction.id === 'fediverse' ? 'me': undefined">
 								<template #icon>
 									<!-- Fix for https://github.com/nextcloud-libraries/nextcloud-vue/issues/2315 -->
 									<img :src="primaryAction.icon" alt="" class="user-actions__primary__icon">