change host.delete() parameter for newer ZBX api.

As of Zabbix API 2.4, host.delete() will not takes parameter with
`hostid` property but only the array of it.
https://www.zabbix.com/documentation/2.2/manual/api/reference/host/delete

fix #1800

monitoring/zabbix_host.py

@@ -240,7 +240,7 @@ class Host(object):
         try:
             if self._module.check_mode:
                 self._module.exit_json(changed=True)
-            self._zapi.host.delete({'hostid': host_id})
+            self._zapi.host.delete([host_id])
         except Exception, e:
             self._module.fail_json(msg="Failed to delete host %s: %s" % (host_name, e))
 
@@ -505,4 +505,3 @@ def main():
 
 from ansible.module_utils.basic import *
 main()
-