desktop: fix splash theme

This is a stupid bug that took far too long to isolate.

debian-11-desktop/plymouthd.conf

@@ -1,6 +1,6 @@
 # <ron> I don't care about PrisonPC branding on inmate desktops.
 #       The only branding I care about is in ppcadm.
-
+#
 # The Debian 11 default splash is loud and Debian-y:
 #   https://wiki.debian.org/DebianArt/Themes/Homeworld
 #
@@ -12,6 +12,9 @@
 #     /sys/firmware/acpi/tables/BGRT.
 #
 # This makes the transition from EFI to plymouth "seamless".
-
+#
+# WARNING: if this file contains any blank lines,
+#          it will silently fail to include the correct theme in the ramdisk,
+#          causing a de facto Theme=text behaviour.
 [Daemon]
 Theme=bgrt