Print Preview Refresh: Fix some destinations sizing issues

- Expand line heights & add margin so that the header is the right
height and the focus highlight for "Manage" doesn't get cut off.
- Set min-height 0 on the list container flex child so that it can
shrink. Otherwise, odd bugs occur since it stays the height of the
content.

Bug: 888411, 888412
Change-Id: I4d61b7c5c2e41bacc29695f3588c20070182c16a
Reviewed-on: https://chromium-review.googlesource.com/1241973
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594030}
2 files changed