Fixing some warnings (#6250)

Co-authored-by: Paul Ritter <ritter.paul1@googlemail.com>

Content.Client/Lobby/UI/LobbyCharacterPreviewPanel.cs

@@ -27,7 +27,6 @@ namespace Content.Client.Lobby.UI
         private readonly IClientPreferencesManager _preferencesManager;
         private readonly IPrototypeManager _prototypeManager;
         private EntityUid? _previewDummy;
-        private string? _previewDummySpecies;
         private readonly Label _summaryLabel;
         private readonly BoxContainer _loaded;
         private readonly BoxContainer _viewBox;