mod_mix_pam: Change subscription type

mod_mix_pam/mod_mix_pam.lua

@@ -196,7 +196,7 @@ local function handle_mix_join(event)
 
     -- TODO: Error handling?
     rm_add_to_roster(origin, stanza.attr.from, {
-        subscription = "from",
+        subscription = "none", -- TODO: This depends on MIX-ANON
         groups = {},
         mix_spid = spid,
     });