[Desktop] UI adjustments in the plus address creation dialog.

List of changes:
* More space after google logo.
* Change proposed plus address container corner radius.
* Change proposed plus address container color to tonal.
* Reduced size of the refresh button.
* Change "Cancel" button color to tonal.

Light mode: https://screenshot.googleplex.com/xYybQpFEN3WktJA
Dark mode: https://screenshot.googleplex.com/C8bSYWtCWnvetGU
Mocks: https://screenshot.googleplex.com/5TfbihAfuvp8f2j
Without flag: https://screenshot.googleplex.com/borzeJxHvgLYK2C

Bug: 342330801
Change-Id: I91c5720a8aa337780c1f5e03c73d146eab8ed151
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5611339


Commit-Queue: Timofey Chudakov <tchudakov@google.com>
Reviewed-by: Jan Keitel <jkeitel@google.com>
Cr-Commit-Position: refs/heads/main@{#1312809}