[BUG] Add Render Streaming HTML updates to FusedVR Client

[vmohan7]

Describe the bug
Some minor changes have been made to the render streaming HTML / JS pages that should be looked at and then the client for FusedVR should be updated accordingly.

[vmohan7]

For example, there were some minor changes included with signalling : https://github.com/Unity-Technologies/UnityRenderStreaming/blob/develop/WebApp/public/js/signaling.js