sysutils/vtm: Update 2025.07.28 => 2025.09.12

Changelogs:
https://github.com/directvt/vtm/releases/tag/v2025.09.12
https://github.com/directvt/vtm/releases (29 releases since 2025.07.28)

While here replace ${LOCALBASE}/etc/vtm with ${ETCDIR}.

PR: 289496