users: Fix list of profiles

Of the profiles that are currently listed, only LiveInstall
actually exists. Use BootCore instead, which all profiles derive
from. In most cases we'll end up locking the root user as part
of config.sh anyway.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>

components/users.xml

@@ -1,5 +1,5 @@
 <image>
-	<users profiles="Cloud-Azure,Cloud-AmazonEC2,Cloud-GCE,Cloud-OpenStack,LiveInstall">
+	<users profiles="BootCore">
 		<!-- The password here does not matter, it will be erased in config.sh -->
 		<user name="root" groups="root" password="linux" home="/root" pwdformat="plain" />
 	</users>