Remove missing config: Sitemap.overwite

Author: yasulab

config/sitemap.rb

@@ -9,7 +9,6 @@
 # TODO: This is workaround. Will be deleted in the future release.
 # https://github.com/kjvarga/sitemap_generator/issues/432
 SitemapGenerator::Sitemap.search_engines.delete(:google)
-#SitemapGenerator::Sitemap.overwrite = true
 
 SitemapGenerator::Sitemap.create do
   # Put links creation logic here.