main/postmarketos-mkinitfs-hook-netboot: update show_splash calls for plymouth

The show_splash function has been replaced by splash_show,
splash_set_message and splash_set_error, but the netboot hook still calls
the old function, logging errors in boot dmesg.

Signed-off-by: Luca Leonardo Scorcia <l.scorcia@gmail.com>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8526>

main/postmarketos-mkinitfs-hook-netboot/APKBUILD

@@ -1,6 +1,6 @@
 maintainer="Aster Boese <asterboese@mailbox.org>"
 pkgname=postmarketos-mkinitfs-hook-netboot
-pkgver=4.2.0
+pkgver=4.2.1
 pkgrel=2
 pkgdesc="Netboot postmarketOS using nbd feature"
 url="https://postmarketos.org"
@@ -21,6 +21,6 @@ package() {
 }
 
 sha512sums="
-c681d0c39eecd9fe5d284e07f9c6f79e41085628abe1c645b8ea3cc4e621fd603fca9db4a555fa689a3268925cb6d23c12baa98986baed452375acd1e3fe26b1  netboot.sh
+d4eb04601ea0cba78412d52946543571a5152a370e574c2a8170474bbf6b3d03b6a8aa771c7c5b2c91ef27f1ee34a8f4fdfc4c6ca64f011776c916f7af90d183  netboot.sh
 3c9c812a6cd25640e6cf4d722cff6c6356d5666ec6009b4c65f89e62211cc406d2cd09e0fdda6b1c1906ee32c3854988ab701cee8811208e3ef666f09e638568  netboot.modules
 "

main/postmarketos-mkinitfs-hook-netboot/netboot.sh

@@ -8,7 +8,7 @@ NBD_BLOCK_SIZE=${deviceinfo_rootfs_image_sector_size:-512}
 setup_usb_network
 start_unudhcpd
 
-show_splash "Waiting for netboot...\\nhttps://postmarketos.org/netboot"
+splash_set_message "Waiting for netboot...\\nhttps://postmarketos.org/netboot"
 
 # Attempt to load the kernel module if CONFIG_BLK_DEV_NBD=m
 modprobe nbd
@@ -16,7 +16,7 @@ modprobe nbd
 # Check that we actually have nbd0 available, otherwise show an error screen.
 if [ ! -b /dev/nbd0 ]; then
 	echo "Failed to get /dev/nbd0, stopping."
-	show_splash "ERROR: Failed to initialise netboot\\nhttps://postmarketos.org/netboot"
+	splash_set_error "ERROR: Failed to initialise netboot\\nhttps://postmarketos.org/netboot"
 	fail_halt_boot
 fi
 
@@ -30,6 +30,6 @@ done
 echo "Connected to $client_ip!"
 
 # Show "Loading" splash again when continuing
-show_splash "Loading..."
+splash_set_message "Loading..."
 
 mount_subpartitions