chore: migrate bare ansible_* facts to ansible_facts[] syntax

tasks/install.yaml

@@ -7,7 +7,7 @@
 
     # install zabbix-web - debian
     - name: "install zabbix-web"
-      when: 'ansible_os_family == "Debian"'
+      when: 'ansible_facts["os_family"] == "Debian"'
       block:
 
         # remove old zabbix-web
@@ -25,7 +25,7 @@
             name: "{{ item }}"
             state: "present"
             update_cache: true
-          when: 'ansible_os_family == "Debian"'
+          when: 'ansible_facts["os_family"] == "Debian"'
           loop:
             - "zabbix-frontend-php"
             - "zabbix-apache-conf"