scripts/ci: remove unnecessary checks from CentOS playbook

Since this playbook is meant for a CentOS 8 install, no need to check
the facts.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

scripts/ci/org.centos/stream/8/build-environment.yml

@@ -17,8 +17,6 @@
         option: enabled
         value: "1"
       when:
-        - ansible_facts['distribution'] == 'CentOS'
-        - ansible_facts['distribution_major_version'] == '8'
         - centos_stream_8
 
     - name: Install basic packages to build QEMU on CentOS Stream 8
@@ -46,6 +44,4 @@
           - systemd-devel
         state: present
       when:
-        - ansible_facts['distribution'] == 'CentOS'
-        - ansible_facts['distribution_major_version'] == '8'
         - centos_stream_8