Normalize music_brainz -> musicbrainz spell

lib/music_library/records.ex

@@ -150,6 +150,6 @@ defmodule MusicLibrary.Records do
   end
 
   defp musicbrainz do
-    Application.get_env(:music_library, :music_brainz, MusicLibrary.Records.MusicBrainz.APIImpl)
+    Application.get_env(:music_library, :musicbrainz, MusicLibrary.Records.MusicBrainz.APIImpl)
   end
 end

lib/music_library/records/importer.ex

@@ -136,6 +136,6 @@ defmodule MusicLibrary.Records.Importer do
   end
 
   defp musicbrainz do
-    Application.get_env(:music_library, :music_brainz, MusicLibrary.Records.MusicBrainz.APIImpl)
+    Application.get_env(:music_library, :musicbrainz, MusicLibrary.Records.MusicBrainz.APIImpl)
   end
 end

lib/music_library_web/live/record_live/import_component.ex

@@ -34,7 +34,7 @@ defmodule MusicLibraryWeb.RecordLive.ImportComponent do
   defp result(assigns) do
     ~H"""
     <li
-      id={"music_brainz_" <> @release_group.id}
+      id={"musicbrainz_" <> @release_group.id}
       class="flex justify-between gap-x-6 py-5 hover:bg-gray-50"
     >
       <div class="flex min-w-0 gap-x-4">