Fix glitch-soc HAML linting issues (#2166)

app/views/layouts/_theme.html.haml

@@ -9,6 +9,5 @@
         = stylesheet_pack_tag pack_path, media: 'all', crossorigin: 'anonymous'
       - else
         = stylesheet_pack_tag "skins/#{theme[:flavour]}/#{theme[:skin]}/#{theme[:pack]}", media: 'all', crossorigin: 'anonymous'
-    - if theme[:preload]
-      - theme[:preload].each do |link|
+    - theme[:preload]&.each do |link|
       %link{ href: asset_pack_path("#{link}.js"), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/

app/views/layouts/embedded.html.haml

@@ -12,7 +12,7 @@
       %link{ rel: 'dns-prefetch', href: storage_host }/
 
     = render_initial_state
-    = javascript_pack_tag "locales", crossorigin: 'anonymous'
+    = javascript_pack_tag 'locales', crossorigin: 'anonymous'
     - if @theme
       - if @theme[:supported_locales].include? I18n.locale.to_s
         = javascript_pack_tag "locales/#{@theme[:flavour]}/#{I18n.locale}", crossorigin: 'anonymous'

app/views/media/player.html.haml

@@ -1,6 +1,6 @@
 - content_for :header_tags do
   = render_initial_state
-  = javascript_pack_tag "locales", crossorigin: 'anonymous'
+  = javascript_pack_tag 'locales', crossorigin: 'anonymous'
   - if @theme
     - if @theme[:supported_locales].include? I18n.locale.to_s
       = javascript_pack_tag "locales/#{@theme[:flavour]}/#{I18n.locale}", crossorigin: 'anonymous'

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

@@ -5,7 +5,7 @@
   = render 'shared/error_messages', object: current_user
 
   - Themes.instance.flavour(@selected)['screenshot'].each do |screen|
-    %img.flavour-screen{ src: full_pack_url("media/#{screen}") }
+    %img.flavour-screen{ src: full_pack_url("media/#{screen}"), alt: '' }
 
   .flavour-description
     = t "flavours.#{@selected}.description", default: ''
@@ -14,7 +14,7 @@
 
   - 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
+      = f.input :setting_skin, collection: Themes.instance.skins_for(@selected), label_method: ->(skin) { I18n.t("skins.#{@selected}.#{skin}", default: skin) }, wrapper: :with_label, include_blank: false
 
   .actions
     = f.button :button, t('generic.use_this'), type: :submit