mod_shared_roster: Normalize JID on unset_presence

Don't forget to normalize the JID handed over from ejabberd_sm on
presence-unavailable.  Without normalization, mod_shared_roster might
fail to look up the storage backend for the given host name, for
example.

Fixes #3752.

src/mod_shared_roster.erl

@@ -870,12 +870,15 @@ c2s_self_presence(Acc) ->
     Acc.
 
 -spec unset_presence(binary(), binary(), binary(), binary()) -> ok.
-unset_presence(LUser, LServer, Resource, Status) ->
+unset_presence(User, Server, Resource, Status) ->
+    LUser = jid:nodeprep(User),
+    LServer = jid:nameprep(Server),
+    LResource = jid:resourceprep(Resource),
     Resources = ejabberd_sm:get_user_resources(LUser,
 					       LServer),
     ?DEBUG("Unset_presence for ~p @ ~p / ~p -> ~p "
 	   "(~p resources)",
-	   [LUser, LServer, Resource, Status, length(Resources)]),
+	   [LUser, LServer, LResource, Status, length(Resources)]),
     case length(Resources) of
       0 ->
 	  lists:foreach(