Remove outdated fixed_ips option from example

According to
https://docs.ansible.com/ansible/latest/collections/openstack/cloud/quota_module.html#ansible-collections-openstack-cloud-quota-module
this option is only available until Nova API v2.35 (we're now on v2.95).

Author: Scott Davidson

examples/projects.yml

@@ -57,7 +57,6 @@ openstack_unlimited_quotas:
   backup_gigabytes: -1
   backups: -1
   cores: -1
-  fixed_ips: -1
   floatingip: -1
   gigabytes: -1
   injected_file_size: -1