fix turbojump

GitOrigin-RevId: 822e0e0830

Jumpy.Shared/Player.cs

@@ -82,7 +82,8 @@ namespace Jumpy {
     // TODO: refactor input to have a virtual "which directions & buttons were being pressed"
     // instead of complicated if-statements in this function.
     void UpdateFromGamePad(GameTime time, History<GamePadState> gamePad) {
-      if (gamePad[0].IsButtonDown(Buttons.A) && airState == AirState.Ground) {
+      if (gamePad[0].IsButtonDown(Buttons.A) && gamePad[1].IsButtonUp(Buttons.A) &&
+          airState == AirState.Ground) {
         pose = Pose.Jumping;
         airState = AirState.Jumping;
         jumpTime = 0.5;