Revert "fix: slug now gets created separate to SlugField upon creation"

This reverts commit 1868c53.

nablapps/events/models/event.py

@@ -8,7 +8,6 @@
 from django.core.exceptions import ValidationError
 from django.db import IntegrityError, models
 from django.urls import reverse
-from django.utils.text import slugify
 
 from nablapps.core.models import TimeStamped, WithPicture
 from nablapps.jobs.models import Company
@@ -125,8 +124,6 @@ def get_short_name(self):
         )
 
     def save(self, *args, **kwargs):
-        if not self.slug:
-            self.slug = slugify(self.headline)
         super().save(*args, **kwargs)
         self.move_waiting_to_attending()