Change /admin/custom_emoji to honor the auto_play_gif setting (#11801)

Fixes #9535

app/helpers/application_helper.rb

@@ -77,8 +77,12 @@ module ApplicationHelper
     content_tag(:i, nil, attributes.merge(class: class_names.join(' ')))
   end
 
-  def custom_emoji_tag(custom_emoji)
+  def custom_emoji_tag(custom_emoji, animate = true)
+    if animate
       image_tag(custom_emoji.image.url, class: 'emojione', alt: ":#{custom_emoji.shortcode}:")
+    else
+      image_tag(custom_emoji.image.url(:static), class: 'emojione custom-emoji', alt: ":#{custom_emoji.shortcode}", 'data-original' => full_asset_url(custom_emoji.image.url), 'data-static' => full_asset_url(custom_emoji.image.url(:static)))
+    end
   end
 
   def opengraph(property, content)

app/views/admin/custom_emojis/_custom_emoji.html.haml

@@ -3,7 +3,7 @@
     = f.check_box :custom_emoji_ids, { multiple: true, include_hidden: false }, custom_emoji.id
   .batch-table__row__content.batch-table__row__content--with-image
     .batch-table__row__content__image
-      = custom_emoji_tag(custom_emoji)
+      = custom_emoji_tag(custom_emoji, animate = current_account&.user&.setting_auto_play_gif)
 
     .batch-table__row__content__text
       %samp= ":#{custom_emoji.shortcode}:"