main/postmarketos-ui-phosh: use xdg-user-dirs (MR 1432)

main/postmarketos-ui-phosh/APKBUILD

 # Maintainer: Bart Ribbers <bribbers@disroot.org>
 pkgname=postmarketos-ui-phosh
 pkgver=3
-pkgrel=0
+pkgrel=1
 pkgdesc="(Wayland) Mobile UI developed for the Librem 5 (works only with numeric passwords!)"
 url="https://puri.sm"
 arch="noarch !armhf"
@@ -26,6 +26,7 @@ _pmb_recommends="calls
 	gnome-software
 	kgx
 	postmarketos-artwork-wallpapers
+	xdg-user-dirs
 	xorg-server-xwayland
 	"
 subpackages="$pkgname-qt_tweaks"