Remove "+" from wireguard route check

This will prevent lixonet from sharing exact addresses like 172.31.1.16 (etc.), which might take precedence over actual Wireguard routes.  The plan is to have Wireguard's metric for the 1.x/24s be lower (or whatever is needed) so that it is always preferred when traffic reaches a wg-enabled host.

bird/bird.conf.tmpl

@@ -93,7 +93,7 @@ function is_own_route_v4()
 
 function is_wireguard_route_v4()
 {
-    {{ if len "${wg_routes:-}" }}{{ range "$wg_routes" | split "," }}if net ~ [ {{.}}+ ] then return true;
+    {{ if len "${wg_routes:-}" }}{{ range "$wg_routes" | split "," }}if net ~ [ {{.}} ] then return true;
     {{ end }}{{ end }}
     return false;
 }