BUG: V-238201 fails if additional entries are present

[pbarrette]

The control parses /etc/pam_pkcs11/pam_pkcs11.conf to find the line containing use_mappers

If that entry looks like the following, the control fails:
use_mappers = digest, cn, pwent, uid, mail, subject, null;

The Check Text states:

If "use_mappers" is not found or the list does not contain "pwent" this is a finding.

The Fix Text states:

Set "use_mappers=pwent" in "/etc/pam_pkcs11/pam_pkcs11.conf" or, if there is already a
comma-separated list of mappers, add it to the list, separated by comma, and before the null
mapper.

Changing line 50 in V-238201.rb from cmp to match corrects the issue.