fido2: quote argument strings in debug output
fido2: quote argument strings in debug output

Tested using

  gocryptfs -init -debug -fido2 "hello world" cipherdir

Output before:

  callFidoCommand: executing "/usr/bin/fido2-cred" with args [fido2-cred -M -h -v hello world]

After:

  callFidoCommand: executing "/usr/bin/fido2-cred" with args ["fido2-cred" "-M" "-h" "-v" "hello world"]

Related: https://github.com/rfjakob/gocryptfs/issues/571

rfjakob/gocryptfs,rfjakob/gocryptfs,rfjakob/gocryptfs,rfjakob/gocryptfs