LibJS: Remove two unused members from ExecutionContext

Author: https://github.com/awesomekling
Commit: a3782782fa
Pull-request: https://github.com/SerenityOS/serenity/pull/24495
Reviewed-by: https://github.com/gmta ✅

Userland/Libraries/LibJS/SyntheticModule.cpp

@@ -81,7 +81,7 @@ ThrowCompletionOr<Promise*> SyntheticModule::evaluate(VM& vm)
     // FIXME: We don't have suspend yet.
 
     // 2. Let moduleContext be a new ECMAScript code execution context.
-    auto module_context = ExecutionContext::create(vm.heap());
+    auto module_context = ExecutionContext::create();
 
     // 3. Set the Function of moduleContext to null.
     // Note: This is the default value.