Remove hidden comment object_pk field from HTML. Refs #1028

- this field is not used when removing comments. Only comment_id
  is actually used!
- get_details_case_run.html was displaying the wrong value for
  object_pk: it was showing TC.pk instead of TE.pk

tcms/templates/case/get_details_case_run.html

@@ -60,7 +60,6 @@ <h4 class="borderB">Comments History ({{ comments_count }}):
 						{% if perms.comments.can_moderate and comment.user.pk == request.user.pk %}
 						<form action="{% url "comments-delete" %}" method="post" class="form_comment" style="display:inline;">
 							<input type="hidden" name="comment_id" value="{{ comment.pk }}" />
-							<input type="hidden" name="object_pk" value="{{ execution.case_id }}" />
 							<input class='commentdelete sprites' value='' type='submit' title="Remove Comment" />
 						</form>
 						{% endif %}