Fix some reviewed issues

Author: 100gle

static/js/passed-state.js

@@ -1,5 +1,3 @@
-
-
 class PassedState {
 
     _key = 'python-type-challenges';

templates/components/challenge_area.html

@@ -108,7 +108,7 @@
           // add confetti effect when passed
           if (json.passed) {
             confetti.addConfetti()
-            // passedState has defined in challenge_sidebar.html
+            // passedState is defined in challenge_sidebar.html
             passedState.setPassed(level, name);
             document.getElementById(`${level}-${name}`).parentNode.classList.add('passed');
           }
@@ -158,7 +158,7 @@
     activeChallengeInList.parentNode.classList.add('active-challenge');  // Highlight
   }
 
-  codeUnderTest = {{code_under_test | tojson}};
-  testCode = {{ test_code | tojson }};
+  let codeUnderTest = {{code_under_test | tojson}};
+  let testCode = {{ test_code | tojson }};
   renderCodeArea(codeUnderTest, testCode, "{{level}}", "{{name}}");
 </script>