Remove "nsfw" category for sensitive statuses in OStatus serializer (#7048)

Fix #7011

app/lib/ostatus/atom_serializer.rb

@@ -364,8 +364,6 @@ class OStatus::AtomSerializer
       append_element(entry, 'category', nil, term: tag.name)
     end
 
-    append_element(entry, 'category', nil, term: 'nsfw') if status.sensitive?
-
     status.media_attachments.each do |media|
       append_element(entry, 'link', nil, rel: :enclosure, type: media.file_content_type, length: media.file_file_size, href: full_asset_url(media.file.url(:original, false)))
     end

app/services/process_hashtags_service.rb

@@ -7,7 +7,5 @@ class ProcessHashtagsService < BaseService
     tags.map { |str| str.mb_chars.downcase }.uniq(&:to_s).each do |tag|
       status.tags << Tag.where(name: tag).first_or_initialize(name: tag)
     end
-
-    status.update(sensitive: true) if tags.include?('nsfw')
   end
 end