wasi: use free() to release preopen array

As this is allocated with `Calloc()`, we cannot use `delete[]` here.

PR-URL: #33110
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node_wasi.cc

@@ -236,7 +236,7 @@ void WASI::New(const FunctionCallbackInfo<Value>& args) {
       free(options.preopens[i].real_path);
     }
 
-    delete[] options.preopens;
+    free(options.preopens);
   }
 }