chore: Fix lint error in PasswordLessLoginForm.vue

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

Author: come-nc

core/src/components/login/PasswordLessLoginForm.vue

@@ -133,7 +133,7 @@ export default defineComponent({
 			this.$emit('update:username', this.user)
 		},
 		completeAuthentication(challenge) {
-			const redirectUrl = this.redirectUrl
+			let redirectUrl = this.redirectUrl
 
 			return finishAuthentication(challenge)
 				.then(({ defaultRedirectUrl }) => {