remove vestigial Status#local_only? definition

app/models/status.rb

@@ -272,10 +272,6 @@ class Status < ApplicationRecord
     end
   end
 
-  def local_only?
-    local_only
-  end
-
   def marked_local_only?
     # match both with and without U+FE0F (the emoji variation selector)
     /👁\ufe0f?\z/.match?(content)