Improve gpg secret key list parser to deal with changes in gpg 2.1.15. Fixes key...

Improve gpg secret key list parser to deal with changes in gpg 2.1.15. Fixes key name display in webapp.

gpg 2.1.15 (or so) seems to have added some new fields to the --with-colons
--list-secret-keys output. These include "fpr" and "grp", and come before
the "uid" line. So, the parser was giving up before it saw the name. Fix by
continuing to look for the uid line until the next "sec" line.

This commit was sponsored by Ole-Morten,Duesund on Patreon.