net/wifibox: Update to 0.8.3

• Add a pkg-message for facilitating initial configuration
• Base sample configuration defaults on the WPA_PASSTHRU port option

This commit is required to be able to merge it to quarterly branch

Changes: https://github.com/pgj/freebsd-wifibox/releases/tag/0.8.3

https://github.com/pgj/freebsd-wifibox-image/releases/tag/snapshot-20220428

MFH: 2022Q2 (usability fixes)
(cherry picked from commit d2dee87cf879710cceaadc35eca720e6b8749388)