fix: call -rf in the proper order

README.md

@@ -262,4 +262,4 @@ automatically generated when creating the service.  It can be replaced by a
 custom certificate by overwriting the `server.crt` and `server.key` files in
 `/var/lib/dokku/services/postgres/<DB_NAME>/data`.
 The `server.key` must be chmoded to 600 and must be owned by the postgres user
-or root.
+or root.

tests/service_destroy.bats

@@ -23,5 +23,5 @@ load test_helper
   dokku "$PLUGIN_COMMAND_PREFIX:link" l app
   run dokku "$PLUGIN_COMMAND_PREFIX:destroy" l
   assert_contains "${lines[*]}" "Cannot delete linked service"
-  rm "$DOKKU_ROOT/app" -rf
+  rm -rf "$DOKKU_ROOT/app"
 }