wg-installer: fix cleanup script

The wrong function was called.

Signed-off-by: Nick Hainke <vincent@systemli.org>

net/wg-installer/common/wg.sh

@@ -15,7 +15,7 @@ next_port () {
 }
 
 cleanup_wginterfaces() {
-    neighbors_available
+    check_wg_neighbors
 }
 
 delete_wg_interface() {