Don't show skins selector when there's only one (#256)

app/javascript/flavours/glitch/reducers/compose.js

@@ -134,7 +134,7 @@ function continueThread (state, status) {
       'advanced_options',
       map => map.merge(new ImmutableMap({ do_not_federate: /👁\ufe0f?\u200b?(?:<\/p>)?$/.test(status.content) }))
     );
-    map.set('privacy', status.visibility);
+    map.set('privacy', privacyPreference(status.visibility, state.get('default_privacy')));
     map.set('sensitive', false);
     map.update('media_attachments', list => list.clear());
     map.set('idempotencyKey', uuid());

app/views/settings/flavours/show.html.haml

@@ -12,6 +12,7 @@
 
   %hr/
 
+  - if Themes.instance.skins_for(@selected).length > 1
     .fields-group
       = f.input :setting_skin, collection: Themes.instance.skins_for(@selected), label_method: lambda { |skin| I18n.t("skins.#{@selected}.#{skin}", default: skin) }, wrapper: :with_label, include_blank: false