Correct states in bigip_pool_member (#41035)

Fixes: #40631

The module was not correctly handling a certain state where the node
could be down, but the monitor was enabled on the node.

This patch fixes it.

lib/ansible/modules/network/f5/bigip_pool_member.py

@@ -465,6 +465,8 @@ class ApiParameters(Parameters):
     def state(self):
         if self._values['state'] in ['user-up', 'unchecked', 'fqdn-up-no-addr'] and self._values['session'] in ['user-enabled']:
             return 'present'
+        elif self._values['state'] == 'down' and self._values['session'] == 'monitor-enabled':
+            return 'present'
         elif self._values['state'] in ['user-down'] and self._values['session'] in ['user-disabled']:
             return 'forced_offline'
         else: