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Fix initial focus for additional terms of service button on eula screen.
And for return focus on exit from System Security setting dialog.

Bug: 1154207
Change-Id: Ie9b9d4f4ae89a7861a22ce29db23ecd1adc8b11e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593264Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Danila Kuzmin <dkuzmin@google.com>
Cr-Commit-Position: refs/heads/master@{#839108}