always update slug of collaborative

Author: Deepthi-Chand

api/models/Collaborative.py

@@ -56,7 +56,7 @@ class Collaborative(models.Model):
     platform_url = models.URLField(blank=True, null=True)
 
     def save(self, *args: Any, **kwargs: Any) -> None:
-        if self.title and not self.slug:
+        if self.title:
             self.slug = slugify(cast(str, self.title))
         super().save(*args, **kwargs)