Fix KeyInputProc bug

[mateofio]

Don't set the variable if not waiting.

Fix: #1613

[Ghabry]

Do you have a minimal test that shows this behaviour?

I did

@> Wait: 0.1 seconds
@> Control Variables: [0001] = 1
@> Key Input Processing: [0001] (Don't wait)

and after the Key Input Variable 1 is 0.

The Wait is just to ensure that no button is buffered

[mateofio]

I used #1613

I can check again a minimal test tonight

[mateofio]

You're right

Wait 1.0s
Var1 = 20
Key Input (No Wait) -> Var1
Text \v[1]

Prints 0. So something more subtle is happening in #1613. I will investigate further and change this.

[mateofio]

This one is totally wrong, so trashed.