main/postmarketos-base-ui-plasma: add replaces on plasma-mobile-meta

Since we replace some files, e.g:
/etc/skel/.local/share/kwalletd/kdewallet.kwl

Part-of: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/6879

main/postmarketos-base-ui-plasma/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Bart Ribbers <bribbers@disroot.org>
 pkgname=postmarketos-base-ui-plasma
 pkgver=2
-pkgrel=14
+pkgrel=15
 pkgdesc="Meta package for shared configuration for Plasma-based UIs"
 url="https://postmarketos.org"
 arch="noarch !armhf" # armhf is not supported
@@ -25,6 +25,7 @@ depends="
 	urfkill
 	xdg-desktop-portal-kde
 	"
+replaces="plasma-mobile-meta"
 # Required to launch
 depends="$depends
 	xorg-server