Fix wrong backup directory var name in apt module (#73840) (#74002)

(cherry picked from commit 2bff120db6)

changelogs/fragments/73840_apt-policy-rc-d.yml

@@ -0,0 +1,4 @@
+bugfixes:
+  - >-
+    apt - fix policy_rc_d parameter throwing an exception when restoring
+    original file (https://github.com/ansible/ansible/issues/66211)

lib/ansible/modules/apt.py

@@ -405,7 +405,7 @@ class PolicyRcD(object):
             try:
                 shutil.move(os.path.join(self.backup_dir, 'policy-rc.d'),
                             '/usr/sbin/policy-rc.d')
-                os.rmdir(self.tmpdir_name)
+                os.rmdir(self.backup_dir)
             except Exception:
                 self.m.fail_json(msg="Fail to move back %s to /usr/sbin/policy-rc.d"
                                      % os.path.join(self.backup_dir, 'policy-rc.d'))