Typo mistake : the incorrect comment of a variable for the RDP setting

I found one issue in the source code of the guacamole server project.

The issue is related to the comment of a variable for the RDP setting.

The issue follows below:

src/protocols/rdp/settings.h

I think that the comment has to be changed to the following:

Whether SFTP should be enabled for the RDP connection.

If this issue is accepted by you, I want to fix it myself.

Thanks.