fix(xo-server/backupNg.importVmBackup): do not try to detect base VDI
fix(xo-server/backupNg.importVmBackup): do not try to detect base VDI

lmcro/xo-web,vatesfr/xo-web,vatesfr/xo-web,lmcro/xo-web,lmcro/xo-web