fixed instructor tab active state

lms/templates/course_navigation.html

@@ -29,9 +29,9 @@ def url_class(url):
       <li class="profile"><a href="${reverse('profile', args=[course.id])}" class="${url_class('profile')}">Profile</a></li>
 % endif
 % if has_staff_access_to_course_id(user, course.id):
-      <li class="instructor"><a href="${reverse('instructor_dashboard', args=[course.id])}" class="${url_class('profile')}">Instructor</a></li>
+      <li class="instructor"><a href="${reverse('instructor_dashboard', args=[course.id])}" class="${url_class('instructor')}">Instructor</a></li>
 % endif
 
     </ol>
   </div>
-</nav>
+</nav>

lms/templates/instructor_dashboard.html

@@ -6,7 +6,7 @@
   <%static:css group='course'/>
 </%block>
 
-<%include file="course_navigation.html" args="active_page=''" />
+<%include file="course_navigation.html" args="active_page='instructor'" />
 
 <section class="container">
 <div class="instructor-dashboard-wrapper">