Fix show diff of a javascript file in repository module is displayed without layout (#37626).

Patch by Trang Tran Thi Quynh. 


git-svn-id: https://svn.redmine.org/redmine/trunk@21883 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/repositories_controller.rb

@@ -286,7 +286,7 @@ class RepositoriesController < ApplicationController
       @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'
+      render :diff, :formats => :html, :layout => 'base.html.erb'
     end
   end