tap-dance: Do not start a sequence on keyup

There was an odd case, which confused the hell out of tap-dance: suppose
you had a number of tap-dance keys, on a layer, and as part of the
tap-dance, you turned that layer off - or had it on one-shot to begin
with. In this case, the keydown event would trigger the tap-dance key,
but the keyup would not. This had two funky consequences:

- tap-dance did not correctly register that the dance has ended.
- pressing any other tap-dance key would interrupt the previous
  tap-dance, and potentially input unwanted characters.

To fix this, we simply do not start a tap-dance sequence on keyup, only
when it is pressed. This way the previous sequence has enough time to
time-out and finish properly, and we don't get confused.

This fixes algernon/ergodox-layout#107.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

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