[WEB] Select album thumbnail (#383)

* Added context menu for album opionts

* choose asset for album thumbnail

* Refactor UpdateAlbumDto to accept albumThumbnailAssetId

* implemented changing album cover on web

* Fixed api change on mobile app

mobile/lib/modules/sharing/services/shared_album.service.dart

@@ -134,7 +134,6 @@ class SharedAlbumService {
       await _apiService.albumApi.updateAlbumInfo(
         albumId,
         UpdateAlbumDto(
-          ownerId: ownerId,
           albumName: newAlbumTitle,
         ),
       );