Fix a reference issue in the task impact job determination logic

awx/main/models/jobs.py

@@ -286,7 +286,7 @@ class Job(UnifiedJob, JobOptions):
     def task_impact(self):
         # NOTE: We sorta have to assume the host count matches and that forks default to 5
         from awx.main.models.inventory import Host
-        if obj.launch_type == 'callback':
+        if self.launch_type == 'callback':
             count_hosts = 1
         else:
             count_hosts = Host.objects.filter(inventory__jobs__pk=self.pk).count()