main/postmarketos-ui-phosh: add postmarketos-tweaks (MR 2107)

Make it easy for users to disable animations, switch to dark mode (by
changing the GTK theme), change suspend time and other tweaks.

[ci:skip-vercheck]: _pmb_recommends change doesn't need rebuild
[ci:skip-build]: already built successfully in CI

main/postmarketos-ui-phosh/APKBUILD

@@ -33,6 +33,7 @@ _pmb_recommends="calls
 	nemo
 	postmarketos-artwork-wallpapers
 	postmarketos-hidden-desktop-entries
+	postmarketos-tweaks
 	postmarketos-welcome-gtk3
 	xdg-user-dirs
 	xwayland