tests: Make the fake webaccess hook registrations look more real
tests: Make the fake webaccess hook registrations look more real

The additional properties will be needed once `aCallAll()` is upgraded
to use `callHookFnAsync()`.

ether/etherpad-lite,ether/etherpad-lite,storytouch/etherpad-lite,ether/etherpad-lite,storytouch/etherpad-lite,storytouch/etherpad-lite