mimic tab behavior on enter keydown on tasks component

[LukeberryPi]

currently, the only way to traverse the task list using the keyboard is to use "tab" (move to next input) or "shift + tab" (move to previous input).

my suggestion is that, on "enter" keydown, the same behavior as "tab" (moving to next input) is executed. similarly, on "shift + enter" keydown, the same behavior as "shift + tab" (moving to previous input) gets executed.

this link might help: https://stackoverflow.com/questions/1009808/enter-key-press-behaves-like-a-tab-in-javascript