Expand emergency button to match size of container when only item in separated list.

Test: Automated tests pass. Enable force grid layout (feature flags) and bug report shortcut to get a 4-item grid, then open the power menu. Emergency button should take up two rows, and space above the icon and below the text should be tappable.

Fixes: 130347549

Change-Id: If44d2fb7d90b33b9b90b3ed970c7751b4bffd0d5