debian: remove duplicate build dependencies
debian: remove duplicate build dependencies

This silences:
https://lintian.debian.org/tags/duplicate-in-relation-field.html

rxcomm/qtile,dequis/qtile,tych0/qtile,jdowner/qtile,frostidaho/qtile,flacjacket/qtile,ramnes/qtile,qtile/qtile,jdowner/qtile,himaaaatti/qtile,himaaaatti/qtile,zordsdavini/qtile,qtile/qtile,flacjacket/qtile,soulchainer/qtile,cortesi/qtile,soulchainer/qtile,ramnes/qtile,dequis/qtile,cortesi/qtile,de-vri-es/qtile,rxcomm/qtile,de-vri-es/qtile,kynikos/qtile,frostidaho/qtile,tych0/qtile,kynikos/qtile,zordsdavini/qtile