Use selected VRF on manual prefix add
Use selected VRF on manual prefix add

This fixes an issue where a manually added prefix would end up in the
wrong VRF as the VRF ID from the selected VRF wasn't used.

Fixes #580.

SoundGoof/NIPAP,garberg/NIPAP,SoundGoof/NIPAP,plajjan/NIPAP,plajjan/NIPAP,SpriteLink/NIPAP,ettrig/NIPAP,fredsod/NIPAP,bbaja42/NIPAP,SoundGoof/NIPAP,SpriteLink/NIPAP,SpriteLink/NIPAP,bbaja42/NIPAP,plajjan/NIPAP,plajjan/NIPAP,SoundGoof/NIPAP,bbaja42/NIPAP,plajjan/NIPAP,garberg/NIPAP,ettrig/NIPAP,garberg/NIPAP,fredsod/NIPAP,SoundGoof/NIPAP,bbaja42/NIPAP,ettrig/NIPAP,garberg/NIPAP,ettrig/NIPAP,garberg/NIPAP,bbaja42/NIPAP,fredsod/NIPAP,fredsod/NIPAP,ettrig/NIPAP,SoundGoof/NIPAP,SpriteLink/NIPAP,fredsod/NIPAP,fredsod/NIPAP,garberg/NIPAP,SpriteLink/NIPAP,ettrig/NIPAP,SpriteLink/NIPAP,bbaja42/NIPAP,plajjan/NIPAP