Default SFTP Public Key to false.

It causes connections to Mystic BBSs to fail, and assumes the
server is running OpenSSH (or Synchronet, which is purposefully
compatible with OpenSSH).

I love the feature, but it's not good enough for on-by-default.

After 1.2 is released, and I do a proper sftp client, I'll likely
remove the option anyway, and just have a way to upload it on
demand.

src/syncterm/bbslist.c

@@ -791,7 +791,7 @@ read_item(str_list_t listfile, struct bbslist *entry, char *bbsname, int id, int
 	else {
 		entry->has_fingerprint = false;
 	}
-	entry->sftp_public_key = iniGetBool(section, NULL, "SFTPPublicKey", true);
+	entry->sftp_public_key = iniGetBool(section, NULL, "SFTPPublicKey", false);
 	iniGetSString(section, NULL, "DownloadPath", home, entry->dldir, sizeof(entry->dldir));
 	iniGetSString(section, NULL, "UploadPath", home, entry->uldir, sizeof(entry->uldir));