fix(ClientUser#setStatus): resetting activity

The method would pass in null if no activity was passed, so this takes the current client presence instead of deleting it.

src/stores/ClientPresenceStore.js

@@ -38,7 +38,7 @@ class ClientPresenceStore extends PresenceStore {
       since: since != null ? since : null, // eslint-disable-line eqeqeq
       status: status || this.clientPresence.status,
       game: activity ? {
-        type: typeof activity.type === 'number' ? activity.type : ActivityTypes.indexOf(activity.type),
+        type: activity.type,
         name: activity.name,
         url: activity.url,
         details: activity.details || undefined,
@@ -54,9 +54,14 @@ class ClientPresenceStore extends PresenceStore {
         application_id: applicationID || undefined,
         secrets: activity.secrets || undefined,
         instance: activity.instance || undefined,
-      } : null,
+      } : this.clientPresence.activity,
     };
 
+    if (packet.game) {
+      packet.game.type = typeof packet.game.type === 'number' ?
+        packet.game.type : ActivityTypes.indexOf(packet.game.type)
+    }
+
     this.clientPresence.patch(packet);
     this.client.ws.send({ op: OPCodes.STATUS_UPDATE, d: packet });
     return this.clientPresence;