BURs: fix tags field not finding all BURs with that tag.

Fix the Tags field in the BUR search form not finding all BURs
mentioning that tag. Specifically, tags that were part of a mass update,
and that were prefixed with `~` or `-` (OR tags and NOT tags), weren't
indexed as tags affected by the BUR.

This requires re-running script/fixes/064_initialize_bulk_update_request_tags.rb
to fix old BURs.

app/logical/bulk_update_request_processor.rb

@@ -196,18 +196,17 @@ class BulkUpdateRequestProcessor
     end
   end
 
-  # The list of tags in the script. Used for search BURs by tag.
-  # @return [Tag] the list of tags
+  # The list of tags in the script. Used to search BURs by tag.
+  # @return [Array<String>] the list of tags
   def affected_tags
     commands.flat_map do |command, *args|
       case command
       when :create_alias, :remove_alias, :create_implication, :remove_implication, :rename
         [args[0], args[1]]
       when :mass_update
-        tags = PostQueryBuilder.new(args[0]).tags + PostQueryBuilder.new(args[1]).tags
-        tags.reject(&:negated).reject(&:optional).reject(&:wildcard).map(&:name)
+        PostQuery.new(args[0]).tag_names + PostQuery.new(args[1]).tag_names
       when :nuke
-        PostQueryBuilder.new(args[0]).tags.map(&:name)
+        PostQuery.new(args[0]).tag_names
       when :change_category
         args[0]
       end