test: the helpers read Steamify's lib list from steamify.sh instead of their own copy

share/bootloader-test/steamify-state.sh

@@ -5,7 +5,7 @@
 pass() { echo "PASS $*"; }; fail() { echo "FAIL $*"; }
 sudo mountpoint -q /mnt || sudo mount -t 9p -o trans=virtio,version=9p2000.L repo /mnt
 cd /mnt || exit 1
-for lib in common state packages login-manager single-user steam-desktop steam-machine fremont-poweroff vram-booster hdmi-refresh cec boot-session vapor-theme steamos-extras bios desktop-shortcut wizard-shortcut steam-game update-notifier; do
+for lib in $(grep -oP '^for lib in \K.*(?=; do$)' steamify.sh); do
     # shellcheck source=/dev/null
     . "lib/$lib.sh" 2>/dev/null
 done