[BUGFIX] Fix folding timer

[nivivon]

In #83, I seem to have accidentally enabled the folding timer always after clicking on a tile. My apologies.

This pull request does three things:

• After clicking a tile, it only applies a timer if it was selected
• When setting the time, it removes the 2s bonus to ensure the actual timer & label match
• It no longer auto starts the timer when changing settings to match the behaviour of the Ukeire quiz. This because the actual timer & labels were mismatched for the first go around, which is unnecessarily confusing.

How to test

• Set the timer. See that the time doesn't move until you click a tile.

Timer.doesn.t.move.mov

• Click a tile when the timer is selected. See the timer count down. When it hits 0, see the tile get discarded.

Timer.works.mov

• Uncheck the timer. Click a tile. Wait long enough to show that the timer is no longer being applied.

Timer.disabled.doesn.t.move.mov

[nivivon]

This was the main issue, missing protecting re-initializing the timer only when it's selected.

[nivivon]

This was removing auto-starting the timer when changing settings due to the mismtch between currentTime/currentBonus & settings.time/extraTime.