Better gamepad axis event injection.

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.

main/input_default.cpp

@@ -783,10 +783,10 @@ void InputDefault::joy_axis(int p_device, int p_axis, const JoyAxis &p_value) {
 		jx.min = p_value.min;
 		jx.value = p_value.value < 0.5 ? 0.6 : 0.4;
 		joy_axis(p_device, p_axis, jx);
-	} else if (ABS(last) > 0.5 && last * p_value.value < 0) {
+	} else if (ABS(last) > 0.5 && last * p_value.value <= 0) {
 		JoyAxis jx;
 		jx.min = p_value.min;
-		jx.value = p_value.value < 0 ? 0.1 : -0.1;
+		jx.value = last > 0 ? 0.1 : -0.1;
 		joy_axis(p_device, p_axis, jx);
 	}