#9 2 checkmarks on timers

[Marc Andrew Pawlowsky]

You can have mutliple checkmarks displayed even though
only the last one turned on is counting.

When a second checkmark is selected, the previous
checkmark should be unselected.

Test case:
Setup multiple tasks.
Click on checkbox to get timer started on one task.
Click on checkbox to get timer started on second task.

The timer is only counting for the second task, though
two checkmarks are displayed.

[Sujee Maniyam]

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fixed in v1.2