prosody: completely disable external components

We are no longer using component connections.

prosody/Dockerfile

@@ -66,6 +66,6 @@ COPY rootfs/ /
 COPY --from=builder /usr/local/lib/lua /usr/local/lib/lua
 COPY --from=builder /usr/local/share/lua /usr/local/share/lua
 
-EXPOSE 5222 5347 5280
+EXPOSE 5222 5280
 
 VOLUME ["/config", "/prosody-plugins-custom"]

prosody/rootfs/defaults/prosody.cfg.lua

@@ -78,6 +78,7 @@ modules_enabled = {
         {{ end }}
 };
 
+component_ports = { }
 https_ports = { }
 
 -- These modules are auto-loaded, but should you want