Fix state=list in ceph_pool module

[cosandr]

This PR fixes list not being allowed by the ceph_pool module, despite being implemented.

I've also fixed a crash caused by an extra parameter being passed.

Traceback (most recent call last):
File "", line 107, in
File "", line 99, in _ansiballz_main
File "", line 47, in invoke_module
File "", line 226, in run_module
File "", line 98, in _run_module_code
File "", line 88, in _run_code
File "/tmp/ansible_ceph.automation.ceph_pool_payload_9wlbrefz/ansible_ceph.automation.ceph_pool_payload.zip/ansible_collections/ceph/automation/plugins/modules/ceph_pool.py", line 718, in
File "/tmp/ansible_ceph.automation.ceph_pool_payload_9wlbrefz/ansible_ceph.automation.ceph_pool_payload.zip/ansible_collections/ceph/automation/plugins/modules/ceph_pool.py", line 714, in main
File "/tmp/ansible_ceph.automation.ceph_pool_payload_9wlbrefz/ansible_ceph.automation.ceph_pool_payload.zip/ansible_collections/ceph/automation/plugins/modules/ceph_pool.py", line 693, in run_module
File "/tmp/ansible_ceph.automation.ceph_pool_payload_9wlbrefz/ansible_ceph.automation.ceph_pool_payload.zip/ansible_collections/ceph/automation/plugins/module_utils/ceph_common.py", line 102, in exec_command
File "/tmp/ansible_ceph.automation.ceph_pool_payload_9wlbrefz/ansible_ceph.automation.ceph_pool_payload.zip/ansible/module_utils/basic.py", line 1860, in run_command
File "/tmp/ansible_ceph.automation.ceph_pool_payload_9wlbrefz/ansible_ceph.automation.ceph_pool_payload.zip/ansible/module_utils/basic.py", line 1860, in
File "", line 296, in expandvars
TypeError: expected str, bytes or os.PathLike object, not bool

The name parameter isn't required for list (neither is it being used), so only make it required if state is not list.