dynamic pawn flight speed issue when switching sublevels

[yuhanliu-tech]

I've been having an issue where, when switching to certain sublevels, the dynamic pawn doesn't immediately recalculate its speed. This causes the pawn to move too far when hitting WASD after just arriving in a new location.

Here's a fix that's worked so far in the dynamic pawn blueprint (updating last world location in event tick).

Thanks! @j9liu