scd: Use the correct gpg for the v1.0 OpenPGP card hack.

* scd/app-openpgp.c (get_public_key): Use gnupg_module_name instead of
just "gpg".
--

There is no bug report regarding this and it would be very unlikely
but we should always use the gpg belonging to our code.

Signed-off-by: Werner Koch <wk@gnupg.org>

scd/app-openpgp.c

@@ -1731,7 +1731,8 @@ get_public_key (app_t app, int keyno)
       hexkeyid = fpr + 24;
 
       ret = gpgrt_asprintf
-        (&command, "gpg --list-keys --with-colons --with-key-data '%s'", fpr);
+        (&command, "%s --list-keys --with-colons --with-key-data '%s'",
+         gnupg_module_name (GNUPG_MODULE_NAME_GPG), fpr);
       if (ret < 0)
         {
           err = gpg_error_from_syserror ();