Switch off Mint 22 for now, same issue as Ubuntu 24.x

roles/netbootxyz/templates/menu/live-mint.ipxe.j2

@@ -6,7 +6,6 @@ goto ${menu} ||
 set os Mint Live
 menu ${os}
 item --gap ${os} Versions
-item 22 ${space} ${os} 22
 item 21 ${space} ${os} 21
 item 20 ${space} ${os} 20
 item lmde ${space} ${os} LMDE