include module_item_id parameter in draft state page redirect

fixes CNVS-12695

test plan:
 - enable draft state
 - add a wiki page to multiple modules
 - click a wiki page link on the modules page
 - the navigation footer should be present on the wiki page

Change-Id: I1e8c1540f40c97e77a289d1dab263dcd748c4475
Reviewed-on: https://gerrit.instructure.com/34300
Reviewed-by: Mark Severson <markse@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Product-Review: Jeremy Stanley <jeremy@instructure.com>

app/controllers/wiki_pages_controller.rb

@@ -44,7 +44,7 @@ class WikiPagesController < ApplicationController
 
   def show
     if @context.feature_enabled?(:draft_state)
-      redirect_to polymorphic_url([@context, :named_page], :wiki_page_id => @page_name || @page, :titleize => params[:titleize])
+      redirect_to polymorphic_url([@context, :named_page], :wiki_page_id => @page_name || @page, :titleize => params[:titleize], :module_item_id => params[:module_item_id])
       return
     end
     @editing = true if Canvas::Plugin.value_to_boolean(params[:edit])

spec/integration/wiki_page_spec.rb

@@ -124,6 +124,11 @@ describe WikiPagesController do
         response.should redirect_to(course_named_page_url(@course, "a-page"))
       end
 
+      it "should forward module_item_id parameter" do
+        get @base_url + "wiki/a-page?module_item_id=123"
+        response.should redirect_to(course_named_page_url(@course, "a-page") + "?module_item_id=123")
+      end
+
       it "should forward /wiki/name/revisions to /pages/name/revisions" do
         get @base_url + "wiki/a-page/revisions"
         response.should redirect_to(course_named_page_revisions_url(@course, "a-page"))