fix: acceptable_content? type mismatch

`request.content_mime_type` (returns `Mime::Type` object) while `request.media_type` (returns plain string).

Author: blocknotes

app/controllers/active_storage_db/files_controller.rb

@@ -28,7 +28,7 @@ def update
     private
 
     def acceptable_content?(token)
-      token[:content_type] == request.content_mime_type &&
+      token[:content_type] == request.media_type &&
         token[:content_length] == request.content_length
     end