fix unclosed paren that made quizzes not work in speedGrader

fixes: #3919

Change-Id: If43e00d1553572ddf3e5aa140292636e5e988051
Reviewed-on: https://gerrit.instructure.com/2461
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Brian Whitmer <brian@instructure.com>
Reviewed-by: Zach Wily <zach@instructure.com>

app/views/quizzes/history.html.erb

@@ -85,8 +85,7 @@
     <% if params[:score_updated] %>
     window.parent && 
     window.parent.INST && 
-    window.parent.INST.refreshGrades && 
-    $.isFunction(window.parent.INST.refreshGrades &&
+    $.isFunction(window.parent.INST.refreshGrades) &&
     window.parent.INST.refreshGrades();
     <% end %>    
   });