Prefix courseware urls with /static, since they are no longer served through collectstatic

cms/djangoapps/contentstore/views.py

@@ -527,7 +527,7 @@ def load_preview_module(request, preview_id, descriptor, instance_state, shared_
         
     module.get_html = replace_static_urls(
         module.get_html,
-        module.metadata.get('data_dir', module.location.course),
+        '/static/' + module.metadata.get('data_dir', module.location.course),
         course_namespace = Location([module.location.tag, module.location.org, module.location.course, None, None])
     )
     save_preview_state(request, preview_id, descriptor.location.url(),

lms/djangoapps/courseware/module_render.py

@@ -280,7 +280,7 @@ def _get_module(user, request, descriptor, student_module_cache, course_id,
 
     module.get_html = replace_static_urls(
         _get_html,
-        module.metadata['data_dir'] if 'data_dir' in module.metadata else '', 
+        '/static/' + module.metadata['data_dir'] if 'data_dir' in module.metadata else '',
         course_namespace = module.location._replace(category=None, name=None))
 
     # Allow URLs of the form '/course/' refer to the root of multicourse directory