fix(DefaultUserFolder): replace Vue 2 @update:value with @update:modelValue on NcTextField

NcTextField changed its emit from `update:value` to `update:modelValue`
in @nextcloud/vue v9 (Vue 3). Replace @update:value with @update:modelValue
so the saveDefaultUserFolder callback is triggered when the user edits
the custom folder name field.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

src/views/Settings/DefaultUserFolder.vue

@@ -14,7 +14,7 @@
 			<div v-if="customUserFolder">
 				<NcTextField v-model="value"
 					:placeholder="t('libresign', 'Customize default user folder')"
-					@update:value="saveDefaultUserFolder" />
+					@update:modelValue="saveDefaultUserFolder" />
 			</div>
 		</div>
 	</NcSettingsSection>