fix(challenges): Added bug modal to classic ch (#15828)

Closes #15740

common/app/routes/challenges/views/classic/Side-Panel.jsx

@@ -6,6 +6,7 @@ import PureComponent from 'react-pure-render/component';
 
 import ns from './ns.json';
 
+import BugModal from '../../Bug-Modal.jsx';
 import ToolPanel from './Tool-Panel.jsx';
 import ChallengeTitle from '../../Challenge-Title.jsx';
 import ChallengeDescription from '../../Challenge-Description.jsx';
@@ -146,6 +147,7 @@ export class SidePanel extends PureComponent {
           unlockUntrustedCode={ unlockUntrustedCode }
           updateHint={ updateHint }
         />
+        <BugModal />
         <Output
           defaultOutput={
 `/**