Incorrect value passed to uc_recurring_invoke() in uc_recurring_fee_cancel()

In uc_recurring_fee_cancel the 'cancel callback' invoke line is:

uc_recurring_invoke($fee->handler, 'cancel callback', array($fee));

I believe it should be:

uc_recurring_invoke($fee->fee_handler, 'cancel callback', array($fee));

Patch containing fix attached.