remove role="application" from problems (TNL-563)

 Committer: Adam Palay <adam@edx.org>

common/lib/xmodule/xmodule/js/fixtures/jsinput_problem.html

 <h2 class="problem-header">Custom Javascript Display and Grading</h2>
 
-<div role="application" class="problem">
+<div class="problem">
     <div>
         <span>
             <section data-processed="true" data-sop="false" data-setstate="WebGLDemo.setState"

lms/templates/problem.html

@@ -7,7 +7,7 @@
 
 <div class="problem-progress"></div>
 
-<div class="problem" role="application">
+<div class="problem">
   ${ problem['html'] }
 
   <div class="action">