Limit max igniter on time

[reilleya]

This is both friendlier to the board and more correct, because the firing time in the packet maxes out at a value.

[reilleya]

Upon further investigation, the issue here is that the software silently changes the value back to 0.25 if it is out of range, not that it doesn't limit it. It should show a popup if they entered a time more than 3s.