Don't check if the plugin is enabled before trying to remove the default 'weave network'

If the plugin wasn't enabled then that network shouldn't exist.
If the network 'weave' doesn't exist then util_op remove-plugin-network will do nothing.
If it does exist for some reason then docker will pause for a while and remove it anyway.

weave

@@ -1303,7 +1303,7 @@ launch() {
 }
 
 stop() {
-    ! is_plugin_v1_enabled || util_op remove-plugin-network weave || true
+    util_op remove-plugin-network weave || true
     warn_if_stopping_proxy_in_env
     docker stop $CONTAINER_NAME >/dev/null 2>&1 || echo "Weave is not running." >&2
     # In case user has upgraded from <v2.0 and left old containers running