Support for --remove-timestamp

[APT37]

No description provided.

[00-kat]

In case someone who knows how to implement it sees this, sudo -k is equivalent to doas -L. sudo -K doesn't seem to have an equivalent, but the doas manpage seems to suggest that doas -L acts like sudo -K but my experimentation shows that it acts like sudo -k instead, so I'm not sure.
(Note: -k = --reset-timestamp and -K = --remove-timestamp)