Merge pull request #3235 from techAPJ/patch-1

FEATURE: add canonical tag to category latest page

app/controllers/list_controller.rb

@@ -82,6 +82,7 @@ class ListController < ApplicationController
     end
 
     define_method("category_#{filter}") do
+      canonical_url "#{Discourse.base_url}#{@category.url}"
       self.send(filter, { category: @category.id })
     end
 
@@ -90,6 +91,7 @@ class ListController < ApplicationController
     end
 
     define_method("parent_category_category_#{filter}") do
+      canonical_url "#{Discourse.base_url}#{@category.url}"
       self.send(filter, { category: @category.id })
     end