acquire-wan-address remove boundness checking

if we're unbound then the script will be called with
empty ADDRESSES and so the usual case will handle this fine
by removing all the previosuly set addresses

examples/acquire-wan-address.fnl

@@ -1,14 +1,6 @@
 (local { : system } (require :anoia))
 (local svc (require :anoia.svc))
 
-(local bound-states
-       { :bound true
-         :rebound true
-         :informed true
-         :updated true
-         :ra-updated true
-         })
-
 (fn changes [old-addresses new-addresses]
   (let [added {}
         deleted {}]
@@ -35,9 +27,6 @@
         dir (svc.open state-directory)]
     (accumulate [addresses []
                  v (dir:events)]
-      ;; we don't handle unbound or stopped, where we should
-      ;; take the addresses away
-      (when (. bound-states (v:output "state"))
-        (update-addresses wan-device addresses (v:output "address"))))))
+      (update-addresses wan-device addresses (v:output "address")))))
 
 { : update-addresses : changes : run }