[Conf] Disable rspamd_update by default (again)

conf/modules.d/rspamd_update.conf

@@ -16,6 +16,7 @@
 rspamd_update {
   rules = "sign+https://updates.rspamd.com/rspamd-${BRANCH_VERSION}.ucl";
   key = "qxuogdh5eghytji1utkkte1dn3n81c3y5twe61uzoddzwqzuxxyb";
+  enabled = false; # Disable this module by default
 
   .include(try=true,priority=5) "${DBDIR}/dynamic/rspamd_update.conf"
   .include(try=true,priority=1,duplicate=merge) "$LOCAL_CONFDIR/local.d/rspamd_update.conf"