Bug: when switching else/knob to Linear it keeps the Exponential value

[dromer]

For the lin/log/exp setting it should be 0 (linear), 1 (logarithmic), >1 (exponential factor).

However if we set to exponent and apply a factor. Then go back to linear the factor is still in place even though the setting should be 0 (the exponential factor gets reset essentially).

In pd-vanilla this works correctly.