Unskip volume show host test

This PS unskips volume show how test because the related bug
was fixed [0] and now the endpoint appears in the policy in code
documentation for "volume_extension:hosts" [1].

[0] I76ca1251cd14da6c777bd48a28906d8362d836b0
[1] https://github.com/openstack/cinder/blob/4ca4f644008f4c89edc472cacda19050367ba54a/cinder/policies/hosts.py

Related-Bug: #1732808
Change-Id: I5ddeb7f11d18c5e7382930aa2e05bf9c5dc1057e
diff --git a/patrole_tempest_plugin/tests/api/volume/test_volume_hosts_rbac.py b/patrole_tempest_plugin/tests/api/volume/test_volume_hosts_rbac.py
index 726f84e..9519cea 100644
--- a/patrole_tempest_plugin/tests/api/volume/test_volume_hosts_rbac.py
+++ b/patrole_tempest_plugin/tests/api/volume/test_volume_hosts_rbac.py
@@ -28,7 +28,6 @@
         self.rbac_utils.switch_role(self, toggle_rbac_role=True)
         self.volume_hosts_client.list_hosts()
 
-    @decorators.skip_because(bug="1732808")
     @decorators.idempotent_id('9ddf321e-788f-4787-b8cc-dfa59e264143')
     @rbac_rule_validation.action(service="cinder",
                                  rule="volume_extension:hosts")