fix(xwiki): enable superadmin flag in xwiki.cfg and always force Distribution Wizard

- Added 'xwiki.superadmin=1' alongside the password in 'xwiki.cfg' to properly activate the superadmin account during bootstrap.
- Simplified 'xwiki.properties': Distribution Wizard config is now always present instead of conditional on the superadmin switch.
- Ensures that the Distribution Wizard ('distribution.wizard.enabled=true') and flavor bootstrap run automatically on first startup.
- This fixes the issue where REST endpoints (/rest/jobs, /repositories) stayed at 404 because the DW never executed.

Ref: https://chat.openai.com/share/7a5d58d2-8e91-4e34-8fa0-8b7d62494e4a

roles/web-app-xwiki/templates/xwiki.cfg.j2

@@ -17,7 +17,9 @@ xwiki.authentication.ldap.update_user=1
 {% else %}
 xwiki.authentication.authclass=com.xpn.xwiki.user.impl.xwiki.XWikiAuthServiceImpl
 {% endif %}
+
 {% if xwiki_superadmin_enabled_switch | bool %}
 # ---- Superadmin must live in xwiki.cfg (not in xwiki.properties)
 xwiki.superadminpassword={{ XWIKI_SUPERADMIN_PASSWORD }}
+xwiki.superadmin=1
 {% endif %}