revising UI state of peer assessment step when in a waiting case

apps/openassessment/templates/openassessmentblock/peer/oa_peer_waiting.html

 {%  extends "openassessmentblock/peer/oa_peer_assessment.html" %}
 
 {% block list_item %}
-<li id="openassessment__peer-assessment" class="openassessment__steps__step step--peer-assessment is--waiting is--empty is--collapsed">
+<li id="openassessment__peer-assessment" class="openassessment__steps__step step--peer-assessment">
 {% endblock %}
 
 {% block title %}