moved s2s starttls config on toplevel (fixed syntax error)

EXTRAS/example-configurations/conf.d/30-tls.yml

@@ -12,6 +12,7 @@ c2s_ciphers: 'TLS_CIPHERS'
 s2s_ciphers: 'TLS_CIPHERS'
 c2s_protocol_options: 'TLS_OPTIONS'
 s2s_protocol_options: 'TLS_OPTIONS'
+s2s_use_starttls
 
 certfiles:
   - /etc/ssl/ejabberd/fullchain.pem

EXTRAS/example-configurations/conf.d/41-s2s.yml

@@ -3,7 +3,6 @@ listen:
     port: 5269
     ip: "::"
     module: ejabberd_s2s_in
-    starttls_required: true
     max_stanza_size: 524288
   -
     port: 5270