ULTIMA8: Unexpected jumping sometimes occurs on left click.

[OMGPizzaGuy]

Version 2.8.0 - This is more obvious when using gamepad or keyboard movement options. A left click can be interpreted as a jump even though right mouse button is not being held or clicked. This can very easily cause a player to jump into water or lava, resulting in death.

The root cause appears to be a check for any movement or holding the "step" button and left clicking. This might be best isolated to "MOVE_MOUSE_DIRECTION"

[OMGPizzaGuy]

Fixed in commit
​https://github.com/scummvm/scummvm/commit/f64f6154a80e6bd2c81866afdacbb6737a5713a4

Candidate for backport