net-p2p/rtorrent: Fix pkg-message

Fix pkg-message since 7d8f99a (drop EXAMPLES, add rc.d script) and point
it to correct location.

Reported by: Jakob Breivik Grimstveit via e-mail
MFH: 2025Q4

(cherry picked from commit 2cf6092ce37d12311ddd14fd42c946a4dee47214)