In the core input handling code we have checks to make sure that if axis
rapidly change sign we inject mid-points to release any pending inputmap
action.
The function though, did not correctly insert the mid-point causing
dpads mapped to an axis that behaves like tri-state buttons (-1,0,1) to
not be released correctly.
This commit fixes that by including in the check the case where the axis
swtiches from abs(1) to 0.
ea89e73a88
