Fix swim oddity

[theballaam96]

If A is held, then B is pressed and released whilst A is held, then the kong won't get out of the dolphin swim move (no matter how much A is pressed) until the animation is over

[theballaam96]

Happens when you press B on the frame before you start a new breaststroke whilst holding A. The key variable is player_paad->0x10.

swim_dolphin unconditionally sets this var to 9 if B is newly pressed (expected)

I believe it's the write at 806d8e90 which causes this overwrite. If we lock this behind no new B press, this might fix the issue