Add xonotic*-xoncompat*.pk3* to the forbidden paths
See xonotic!102 (merged) for more context about this change.
Assets from removed Xonotic maps will be placed in a xoncompat
pk3, similar to the nexcompat
pk3 (that contains Nexuiz assets).
This MR adds the xoncompat
pk3 to the list of forbidden paths.
I didn't test this change yet, as I don't have access to my computer atm and made this commit via the Gitlab IDE.