profile_tasks: Fix last task time with multiple plays (#53065)

changelogs/fragments/52760-fix-last-task-time-with-multiple-plays.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - profile_tasks callback - Fix the last task time when running multiple plays (https://github.com/ansible/ansible/issues/52760)

lib/ansible/plugins/callback/profile_tasks.py

@@ -171,6 +171,7 @@ class CallbackModule(CallbackBase):
         self._display.display(filled("", fchar="="))
 
         timestamp(self)
+        self.current = None
 
         results = self.stats.items()