fix: remove subcommand trait on ok command

[tri-adam]

Remove subcommand trait from Ok. This fixes the prior behaviour where the usage was printed rather than the expected functionality occurring.

With the fix:

$ sudo snpguest ok 
[ PASS ] - SEV: ENABLED
[ PASS ] - SEV-ES: ENABLED
[ PASS ] - SNP: ENABLED
[ PASS ] - Optional Features statuses:
[ PASS ]   - VTOM: DISABLED
[ PASS ]   - ReflectVC: DISABLED
[ PASS ]   - Restricted Injection: DISABLED
[ PASS ]   - Alternate Injection: DISABLED
[ PASS ]   - Debug Swap: DISABLED
[ PASS ]   - Prevent Host IBS: DISABLED
[ PASS ]   - SNP BTB Isolation: DISABLED
[ PASS ]   - VMPL SSS: DISABLED
[ PASS ]   - Secure TSE: DISABLED
[ PASS ]   - VMG Exit Parameter: DISABLED
[ PASS ]   - IBS Virtualization: DISABLED
[ PASS ]   - VMSA Reg Prot: DISABLED
[ PASS ]   - SMT Protection: DISABLED

Fixes #55

[tylerfanelli]

LGTM, thanks