Fix clear history in contacts

www/common/outer/messenger.js

@@ -893,7 +893,7 @@ define([
     };
 
     var clearOwnedChannel = function (ctx, id, cb) {
-        var channel = ctx.clients[id];
+        var channel = ctx.channels[id];
         if (!channel) { return void cb({error: 'NO_CHANNEL'}); }
         if (!ctx.store.rpc) { return void cb({error: 'RPC_NOT_READY'}); }
         ctx.store.rpc.clearOwnedChannel(id, function (err) {