fix(sharing): list accounts with matches in email

* Show users with matches in the email address.
* List email addresses in sharing dialog.

`NcSelect` filters the options based on matches in `label` and `subname`.
By using the email address as a subname we ensure
options with a matching email address are shown.

Signed-off-by: Max <max@nextcloud.com>

src/components/board/SharingTabSidebar.vue

@@ -137,9 +137,13 @@ export default {
 		},
 		formatedSharees() {
 			return this.unallocatedSharees.map(item => {
+				const subname = item.label === item.shareWithDisplayNameUnique
+					? ''
+					: item.shareWithDisplayNameUnique
 				const sharee = {
 					user: item.value.shareWith,
 					displayName: item.label,
+					subname,
 					icon: 'icon-user',
 					multiselectKey: item.shareType + ':' + item.primaryKey,
 				}