fix diff view

Author: root

lib/redmine_git_hosting/patches/repositories_controller_patch.rb

@@ -152,7 +152,7 @@ def diff_with_options
           @changeset = @repository.find_changeset_by_name @rev
           @changeset_to = @rev_to ? @repository.find_changeset_by_name(@rev_to) : nil
           @diff_format_revisions = @repository.diff_format_revisions @changeset, @changeset_to
-          render :diff, formats: :html, layout: 'base.html.erb'
+          render :diff, formats: :html, layout: 'base'
         end
       end
     end