Plugin schedule fix (#4295)

* Cleanup old info message (seems out of place)

* Wrap called function in quotes

- Doesn't work if you pass the function object itself

* Fix path to called method

This must have been broken for a while?

InvenTree/plugin/apps.py

@@ -53,6 +53,3 @@ class PluginAppConfig(AppConfig):
 
         if not registry.git_is_modern:  # pragma: no cover  # simulating old git seems not worth it for coverage
             log_error(_('Your environment has an outdated git version. This prevents InvenTree from loading plugin details.'), 'load')
-
-        else:
-            logger.info("Plugins not enabled - skipping loading sequence")  # pragma: no cover