fix: init rrweb with load event or with document.readyState

[amertak]

Description

When rrweb is loaded, it checks if document.readyState is complete or interactive. If not it attaches event handler to the load event.

However when load event is emitted thru 3rd party code then rrweb initializes event handlers again without proper clean up.

Solution is to initialize rrweb like it directly goes to init and not attaches itself to the load event.

Type of change

Delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How has this been tested?

• Manual testing