Remove onload simulator from loading test
Remove onload simulator from loading test

This used to exist to reproduce the functionality in the window.onload handler
in vector/index.js -- which got removed in 31915db. Having it here is confusing
at best.

martindale/vector,martindale/vector,vector-im/vector-web,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web,vector-im/vector-web,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web