oneshot: Fix argument count issue with custom hostname

The new hostnme was treated like multiple arguments causing the oneshot
to fail on first boot and still using the default generated hostname...

I really should've tested the command before committing :^)

Author: JamiKettunen

rpm/jolla-configuration-cheeseburger.spec

@@ -3,7 +3,7 @@
 
 Name: jolla-configuration-%{device}
 Summary: Jolla Configuration %{device}
-Version: 1.4.0
+Version: 1.4.1
 Release: 0
 License: BSD-3-Clause
 Source: %{name}-%{version}.tar.gz

sparse/usr/lib/oneshot.d/hostname-custom

@@ -1,5 +1,5 @@
 #!/bin/sh
 set -e
 if [ ! -f /etc/hostname ]; then
-	hostnamectl set-hostname `ssu-sysinfo --pretty-name | cut -d'(' -f1 | xargs`
+	hostnamectl set-hostname "$(ssu-sysinfo --pretty-name | cut -d'(' -f1 | xargs)"
 fi