fix(prosody): Bump s2s limits for visitors.

prosody/rootfs/defaults/conf.d/visitors.cfg.lua

@@ -51,6 +51,9 @@ limits = {
     c2s = {
         rate = "512kb/s";
     };
+    s2sin = {
+        rate = "512kb/s";
+    };
 }
 
 authentication = 'internal_hashed'