fix test configuration: enable modules so ejabberd creates their sql …

…tables

and later those tables can be updated without errors by mod_admin_update_sql
when ci.yml calls "make test"

test/ejabberd_SUITE_data/ejabberd.yml

@@ -132,6 +132,9 @@ Welcome to this XMPP server."
   mod_stats: []
   mod_s2s_dialback: []
   mod_legacy_auth: []
+  mod_mix_pam: []
+  mod_mqtt: []
+  mod_shared_roster: []
   mod_stream_mgmt:
     max_ack_queue: 10
     resume_timeout: 3