Skip to start/end broken on reconnected replays

[beheh]

For example https://hsreplay.net/replay/UPAYXwzXNrFRikUZpXseXd.

Expected:

• Left/Right should scrub to beginning/end of turn

What happens instead:

• Left/Right scrubs to the beginning/end of the whole replay

[beheh]

Need to write some specs for GameStateScrubber.

[beheh]

Specs coming later.