Fix to one-step-at-a-time mode

In one-step-at-a-time mode, as well as tapping the button to move one square, you're supposed to be able to hold a directional button to move continuously, with Snek stopping when you let go of all the directions. At some point in the latter days of early access, a bug crept into that mode, and you could only tap, not hold. I've just done a quick fix for that, and one-step-at-a-time mode is now working as it should be. It supposed to be an accessibility mode to make the game more suited to your abilities and preferences, so sorry if it was feeling a little awkward!




Fixes:

• At some point, the ability to hold down a direction button during one-step-at-a-time mode got broken ... it's now fixed.