device-nokia-n9: remove Weston configuration (MR 4713)

The only relevant backend available for Weston nowadays is the DRM one, so
remove this unnecessary config.

device/testing/device-nokia-n9/APKBUILD

 # Reference: <https://postmarketos.org/devicepkg>
 pkgname=device-nokia-n9
-pkgver=1
-pkgrel=16
+pkgver=2
+pkgrel=0
 pkgdesc="Nokia N9"
 url="https://postmarketos.org"
 arch="armhf"
 license="MIT"
 depends="postmarketos-base linux-nokia-n9 ofono watchdog-kick"
 makedepends="devicepkg-dev"
-subpackages="$pkgname-weston:weston"
 source="
 	deviceinfo
 	initfs-hook.sh
-	weston.ini
 "
 options="!check !archcheck"
 
@@ -24,12 +22,6 @@ package() {
 	devicepkg_package $startdir $pkgname
 }
 
-weston() {
-	install_if="$pkgname weston"
-	install -Dm644 "$srcdir"/weston.ini \
-		"$subpkgdir"/etc/xdg/weston/weston.ini
-}
-
 nonfree_firmware() {
 	pkgdesc="Wifi firmware"
 	depends="linux-firmware"
@@ -39,5 +31,4 @@ nonfree_firmware() {
 sha512sums="
 f1a940b092e38d241a81828bbf3116ec07684e89519ed16cb9b1c271685979f0bce070d615f21af833d765a28cc92d8438e0306be7c34cb184c9b7d949a55649  deviceinfo
 194b135573da8c894b079bc00cf560e318a62d71ed3dd63f219f0f80d0f882b7d41e988c9c0945319a665e0f217c8eb5ff5353acafe25fa755a84e9e8de3df4b  initfs-hook.sh
-de794566118f1744d068a94e6a75b61d43f6749a4b0871a5270fa7a2048164d609c71fcffa61845c2a7dd4cb5fbeb72c0e4f8b73b382f36d6ff0bcc9b8a5ae25  weston.ini
 "

device/testing/device-nokia-n9/weston.ini

-[core]
-xwayland=true
-backend=drm-backend.so
-[shell]
-background-image=/usr/share/wallpapers/postmarketos.jpg