[#2873] Use resource.url as raw_resource_url

`resource_view` template uses raw_resouce_url in order to create
download link if resource can't be displayed, but this variable is not
passed into snippet. To make that simpler, use resource.url property
for download button.

Conflicts:
	ckan/templates/package/snippets/resource_view.html

ckan/templates/package/snippets/resource_view.html

@@ -27,7 +27,7 @@
         </p>
         <p id="data-view-error" class="collapse"></p>
         <p>
-          <a href="{{ raw_resource_url }}" class="btn btn-large resource-url-analytics" target="_blank">
+          <a href="{{ resource.url }}" class="btn btn-large resource-url-analytics" target="_blank">
             <i class="icon-large icon-download"></i>
             {{ _('Download resource') }}
           </a>