Update `net-mgmt/wifimgr' to version 1.14, which brings:

• Fix lagg(4) interfaces support which broke after FreeBSD 12.2
• Fix parsing of ifconfig(8) output to handle data in any order

While here, do not try to update icon cache which breaks non-root
installation, it is handled by the port via INSTALLS_ICONS anyway.

PR: 250302
Approved by: maintainer
Timeout from: pi (three months)