uradvd: announce on client bridge

package/gluon-mesh-batman-adv/luasrc/lib/gluon/radvd/arguments

@@ -6,7 +6,7 @@ local f = io.open("/tmp/range6","r")
 if f then
     local range6 = f:read('*a')
     f:close()
-    io.write("-i local-node -p " .. range6)
+    io.write("-i br-client -p " .. range6)
 
     if site.dns.servers() and site.next_node.ip6() then
         io.write(" --rdnss " .. site.next_node.ip6())