LibJS: Remove implicit wrapping/unwrapping of completion records

This is an editorial change in the ECMA-262 spec, with similar changes
in some proposals.

See:
- https://github.com/tc39/ecma262/commit/7575f74
- https://github.com/tc39/proposal-array-grouping/commit/df899eb
- https://github.com/tc39/proposal-shadowrealm/commit/9eb5a12
- https://github.com/tc39/proposal-shadowrealm/commit/c81f527

Userland/Libraries/LibJS/Runtime/ModuleEnvironment.cpp

@@ -87,7 +87,7 @@ ThrowCompletionOr<void> ModuleEnvironment::create_import_binding(FlyString name,
         module,
         move(binding_name) });
 
-    // 4. Return NormalCompletion(empty).
+    // 4. Return unused.
     return {};
 }