new Brave button hover states

[jkup]

• 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).

Fix #5528

Test Plan:

Hover over the Brave lion in the top right corner and make sure it looks like the GIF below.

@bradleyrichter this is what it looks like now. is this right?

[bbondy]

Assuming this doesn't cause a problem without it on 0.12.9 I'm moving this to 0.12.10.
@bradleyrichter this is waiting on your feedback pls.

[bradleyrichter]

I think this is missing the new images I committed yesterday? And the grey effect should be removed.

On Nov 11, 2016, at 6:40 AM, Brian R. Bondy notifications@github.com wrote:

Assuming this doesn't cause a problem without it on 0.12.9 I'm moving this to 0.12.10.
@bradleyrichter this is waiting on your feedback pls.

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[bradleyrichter]

New pngs Commit number: 881b722

On Nov 11, 2016, at 6:40 AM, Brian R. Bondy notifications@github.com wrote:

Assuming this doesn't cause a problem without it on 0.12.9 I'm moving this to 0.12.10.
@bradleyrichter this is waiting on your feedback pls.

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[bbondy]

This needs rebasing pls

[jkup]

@bbondy rebased!

@bradleyrichter I see, I started on this ticket without knowing you needed to add some more assets. Is it looking right now? (see GIF above)

[bradleyrichter]

@jkup It looks correct but now we can remove the dark filter in the CSS.

Let's get it in master and then I can work with the hover state image if more visual change is needed.

[bsclifton]

I like it! 🦁

[jkup]

@bradleyrichter @bsclifton I removed the dark filter but now I can hardly tell the difference between the two images. I updated the GIF in the description. Should we just go ahead and ship for now?

[bradleyrichter]

@jkup perfect. Now I can modify the hover image and get it working perfectly through the magic of pixels. ; )

I'll merge it into master and I'll hot-fix the PNG file.