Fix testclient.html for latest Chrome
Fix testclient.html for latest Chrome

Unfortunately, the `loadRemoteData` trick we used to load data no
longer works. The new trick is to load asynchronously, and defer
initialization to `onload`.

Zarel/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client,sirDonovan/Pokemon-Showdown-Client,sirDonovan/Pokemon-Showdown-Client,sirDonovan/Pokemon-Showdown-Client,sirDonovan/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client