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When the user has clicked the Restart button, there is a delay while
Crostini is shutting down before we close the dialog. We disable the
buttons in this state as feedback that something is happening and the
user shouldn't proceed yet.

Bug: 1060830
Change-Id: If0e654c6f63e182efc3e8d178cd2237db9a09807
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2099346Reviewed-by: Nic Hollingum <hollingum@google.com>
Reviewed-by: David Munro <davidmunro@google.com>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749516}