Variable optimisation for hbbr rc.d service

Variable based IP definition, can be set from /etc/rc.conf

rcd/rustdesk-hbbr

@@ -25,7 +25,7 @@ rcvar=rustdesk_hbbr_enable
 load_rc_config $name
 
 : ${rustdesk_hbbr_enable:=NO}
-: ${rustdesk_hbbr_args:=""}
+: ${rustdesk_hbbr_args="-k _"}
 : ${rustdesk_hbbr_user:=rustdesk}
 : ${rustdesk_hbbr_group:=rustdesk}
 
@@ -33,7 +33,6 @@ pidfile=/var/run/rustdesk_hbbr.pid
 command=/usr/sbin/daemon
 procname=/usr/local/sbin/hbbr
 rustdesk_hbbr_chdir="/var/lib/rustdesk-server/"
-rustdesk_hbbr_args="-k _"
 command_args="-p ${pidfile} -o /var/log/rustdesk-hbbr.log ${procname} ${rustdesk_hbbr_args}"
 ## If you want the daemon do its log over syslog comment out the above line and remove the comment from the below replacement
 #command_args="-p ${pidfile} -T ${name} ${procname} ${rustdesk_hbbr_args}"