Fixed the bookmark hanger being faded in

[luixxiul]

Fixes #6380

Auditors:

Test Plan:

1. Bookmark a page with the star icon on the URL bar
2. Make sure "Bookmark Added" dialog is instantly prompt without animation

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

unintentionally I broke the animation. I've been not sure that the bookmark dialog was included in #navigator.

[bsclifton]

@jkup would you be able to check this one out? If it looks good, let's mark with a ready-for-merge (but don't actually merge it yet)

[jkup]

Not crazy about that selector, it's a bit tough to read. If we're going to keep the wildcard + :not selector can we at least add a comment that says something like:

/* Animate all direct descendants except for the bookmark bar */

Just something to make it easier for the next dev to understand! Otherwise ++

[luixxiul]

ok updated, thanks.

[jkup]

thanks @luixxiul ++

[luixxiul]

I'll rebase

[luixxiul]

I close this PR since it doesn't use Aphrodite:
https://github.com/brave/browser-laptop/wiki/Reviewer-guideline