main/postmarketos-ui-*: remove hardcoded dependency on pulseaudio (MR 5145)

This allows the audio switching backend stuff to work on all UIs (see
!5072 / 87d355e08). For example, users of any UI can switch audio
backends by installing one of the pmos-base-ui-audio-* metapackages.

[ci:skip-build] already built successfully in CI

main/postmarketos-base-ui-gnome/APKBUILD

@@ -1,7 +1,7 @@
 # Maintainer: Oliver Smith <ollieparanoid@postmarketos.org>
 pkgname=postmarketos-base-ui-gnome
 pkgver=3
-pkgrel=6
+pkgrel=7
 pkgdesc="Meta package for shared configuration for GNOME-based UIs"
 url="https://postmarketos.org"
 arch="noarch"
@@ -16,7 +16,6 @@ depends="
 	postmarketos-base-ui
 	postmarketos-base-ui-networkmanager
 	power-profiles-daemon
-	pulseaudio
 	xdg-desktop-portal-gnome
 	xdg-desktop-portal-gtk
 	xdg-user-dirs