Fix: arcs-live whitelist  (#4164)
Fix: arcs-live whitelist  (#4164)

* update whitelist: `/`

* Include wasm, made modalities more robust

PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs