fixing a hilarious bug in auto-cruise

the bug: dropping cruise DURING A (SLOW) RESUME would save the
possibly-quite-slow “previous cruise speed”, possibly lower than the
auto-cruise level.  This is not intentional, as auto cruise should be
the slowest possible cruise speed.

also fattened the “cancel cruise” input range to 10%, I think touchy
nunchucks are accidentally killing resume function :/