Django 3 fix for learn-wagtail/core/wagtail_hooks.py

[guideprojects]

Great video about updating the admin panel. Thank you!

This issue is regarding:
learn-wagtail/core/wagtail_hooks.py

If you're using Django 3, you can replace

from django.contrib.staticfiles.templatetags.staticfiles import static
with
from django.templatetags.static import static