Fix admin interface crashing when listing boosts with non-video media attachments

Fix regression introduced by mastodon#12879

Author: ClearlyClaire

app/views/admin/reports/_status.html.haml

@@ -15,7 +15,7 @@
       - if status.proper.media_attachments.first.video?
         - video = status.proper.media_attachments.first
         = react_component :video, src: video.file.url(:original), preview: video.file.url(:small), blurhash: video.blurhash, sensitive: status.proper.sensitive?, visible: false, width: 610, height: 343, inline: true, alt: video.description
-      - elsif status.media_attachments.first.audio?
+      - elsif status.proper.media_attachments.first.audio?
         - audio = status.proper.media_attachments.first
         = react_component :audio, src: audio.file.url(:original), height: 110, alt: audio.description, duration: audio.file.meta.dig(:original, :duration)
       - else