re-add the peer grading tab for students

lms/templates/courseware/course_navigation.html

@@ -17,19 +17,17 @@ def url_class(is_active):
   <div class="inner-wrapper">
     <ol class="course-tabs">
       % for tab in get_course_tabs(user, course, active_page):
-        % if tab.name != "Grading Panel" or staff_access:
-          <li>
-             <a href="${tab.link | h}" class="${url_class(tab.is_active)}">
-                 ${tab.name | h}
-                 % if tab.is_active == True:
-                  <span class="sr">, current location</span>
-                 %endif
-                 % if tab.has_img == True:
-                    <img src="${tab.img}"/>
-                 %endif
-             </a>
-          </li>
-        % endif
+        <li>
+           <a href="${tab.link | h}" class="${url_class(tab.is_active)}">
+               ${tab.name | h}
+               % if tab.is_active == True:
+                <span class="sr">, current location</span>
+               %endif
+               % if tab.has_img == True:
+                  <img src="${tab.img}"/>
+               %endif
+           </a>
+        </li>
       % endfor
     <%block name="extratabs" />
         % if masquerade is not UNDEFINED: