CoseSignTool.exe validate incorrectly passes validation

[elantiguamsft]

CoseSignTool.exe validate appears to falsely report successful validation when the certificate chain does not lead to a known root.

This appears to be isolated to just the CoseSignTool.exe validate command line tool and not the CoseHandler API.

Repro steps:

1.) Produce a detached COSE signature (See: Sign command)
1.) Make sure that the root CA of the signing certificate is not installed in trusted root store
2.) Attempt to call CoseSignTool.exe validate on the payload and previously produced .cose file with no /Roots specified
3.) Observe "Validation succeeded message"

[elantiguamsft]

Closing issue, solved by #67