src: remove duplicated code

PR-URL: #32719
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

src/spawn_sync.cc

@@ -1040,8 +1040,7 @@ Maybe<int> SyncProcessRunner::CopyJsStringArray(Local<Value> js_value,
       js_array
           ->Set(context,
                 i,
-                value->ToString(env()->isolate()->GetCurrentContext())
-                    .ToLocalChecked())
+                string)
           .Check();
     }