Move the extra sink argument down a layer so that reinstalls work properly

src/lager_handler_watcher.erl

@@ -48,10 +48,10 @@ start(Sink, Module, Config) ->
     gen_server:start(?MODULE, [Sink, Module, Config], []).
 
 init([Sink, Module, Config]) when is_list(Config) ->
-    install_handler(Sink, Module, [{sink, Sink}|Config]),
+    install_handler(Sink, Module, Config),
     {ok, #state{sink=Sink, module=Module, config=Config}};
 init([Sink, Module, Config]) ->
-    install_handler(Sink, Module, [{sink, Sink}]++[Config]),
+    install_handler(Sink, Module, [Config]),
     {ok, #state{sink=Sink, module=Module, config=Config}}.
 
 handle_call(_Call, _From, State) ->
@@ -92,7 +92,7 @@ code_change(_OldVsn, State, _Extra) ->
 %% internal
 
 install_handler(Sink, Module, Config) ->
-    case gen_event:add_sup_handler(Sink, Module, Config) of
+    case gen_event:add_sup_handler(Sink, Module, [{sink, Sink}|Config]) of
         ok ->
             ?INT_LOG(debug, "Lager installed handler ~p into ~p", [Module, Sink]),
             lager:update_loglevel_config(Sink),