Fix sizing of done/redo button on mobile todo page

What does this MR do and why?

When viewed in a very small viewport, the done/redo button on a todo item in the Vue todo page is growing to its parent height. This also affects the un-snooze button. This MR corrects this by setting an appropriate align-self rule on the parent.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Check out this branch
2. Visit the Vue todos page
3. Ensure your viewport is in the xs breakpoint range (smaller than 576px wide)

Related to #499696