Correctify health_url param

It's empirical best practice to have a the relative path included in the configuration hostname configuration, too. (`hostname-debug` is a handy option for debugging this).

For example:

keycloak_quarkus_hostname: "https://sso-test.example.loc/auth"
keycloak_quarkus_http_relative_path: "/auth" # must start with `/`

roles/keycloak_quarkus/vars/main.yml

@@ -4,8 +4,7 @@ keycloak: # noqa var-naming this is an internal dict of interpolated values
   config_dir: "{{ keycloak_quarkus_config_dir }}"
   bundle: "{{ keycloak_quarkus_archive }}"
   service_name: "keycloak"
-  health_url: "{{ keycloak_quarkus_hostname }}{{ keycloak_quarkus_http_relative_path }}{{ '/' \
-               if keycloak_quarkus_http_relative_path | length > 1 else '' }}{{ keycloak_quarkus_health_check_url_path | default('realms/master/.well-known/openid-configuration') }}"
+  health_url: "{{ keycloak_quarkus_hostname }}/{{ keycloak_quarkus_health_check_url_path | default('realms/master/.well-known/openid-configuration') }}"
   cli_path: "{{ keycloak_quarkus_home }}/bin/kcadm.sh"
   service_user: "{{ keycloak_quarkus_service_user }}"
   service_group: "{{ keycloak_quarkus_service_group }}"