Delete misleading comment in Es6ConvertSuper

The pass does not completely remove the Feature.SUPER from the AST. It only rewrites `super.method()`. The super() rewriting happens later during Es6ConvertSuperConstructorCalls inside class rewriting.

PiperOrigin-RevId: 623232913

Author: rishipal

src/com/google/javascript/jscomp/Es6ConvertSuper.java

@@ -226,6 +226,5 @@ public void process(Node externs, Node root) {
     // Might need to synthesize constructors for ambient classes in .d.ts externs
     TranspilationPasses.processTranspile(compiler, externs, FEATURES_TO_RUN_FOR, this);
     TranspilationPasses.processTranspile(compiler, root, FEATURES_TO_RUN_FOR, this);
-    // TODO(rishipal): mark super feature as transpiled away
   }
 }