net/findomain: Fix fetch and build
It fixes the following errors:
- No SHA256 checksum recorded for Findomain-findomain-5.0.0_GH0.tar.gz The correct distname is Findomain-findomain-5.0.0_GH0.tar.gz (the checksum has not changed)
- Missing license file for GPLv3 in /wrkdirs/usr/ports/net/findomain/work/findomain-5.0.0/LICENSE The correct wkrsrc is Findomain-xxx
Approved by: portmgr (build fix blanket)