drop-down filters in iOS and Android don't update on first selection (only after reselecting)

[bicarbon8]

when filtering by priority, projects and contexts on iOS and Android browsers (Safari, Chrome) the tasks don't update until you reselect the filter drop-down (at which point it updates correctly)

REPRO:

1. open the index.html file through Safari or Chrome on iOS or Android
2. import a todo.txt file on Android or create some representative tasks that contain valid priorities, projects and contexts
3. click / tap on one of the filter drop-downs and select one of the items to be used as a filter
4. select done or otherwise close the control

ACTUAL:
the tasks are not filtered until you repeat steps 3 and 4

EXPECTED:
the tasks are filtered appropriately

[bicarbon8]

no longer valid as of 1b442be