[Desktop] "Open in Tor" button needs minor UI polish when window is not in focus

[LaurenWags]

Description

Found while testing #806

If you visit a site like brave.com in a normal window the Open in Tor button is shown in the URL bar. If you click elsewhere so the window is not in focus, the text on the button goes gray but the window icon to the right stays white. It looks a little odd. It is similar to this report of the bookmark icon not being dimmed when window is not in focus #11682

Steps to Reproduce

1. Navigate to brave.com in a normal window
2. Click elsewhere so the window is not in focus

Actual result:

Open in Tor text is gray, window icon to the right is white

Expected result:

Text and icon colors to be the same when window is not in focus

for reference, this is what it looks like when the window is in focus:

Reproduces how often:

easily

Brave version (brave://version info)

Brave	1.17.65 Chromium: 87.0.4280.49 (Official Build) unknown (x86_64)
Revision	f77f85899646b42a1d3c8ff36794e00becab9171-refs/branch-heads/4280@{#1115}
OS	macOS Version 10.14.6 (Build 18G6032)

Version/Channel Information:

• Can you reproduce this issue with the current release? n/a 1.16.x
• Can you reproduce this issue with the beta channel? yes 1.17.x
• Can you reproduce this issue with the nightly channel? yes 1.18.x

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

cc @rebron

[LaurenWags]

also occurs on the Tor window with the "Onion Available" button in URL bar:

[rebron]

Might be how we want it to look in the unfocused state though. cc: @karenkliu This is the Tor button faded in an unfocused state with the expected behavior (?) to remain bright even in unfocused state.

[karenkliu]

@rebron I think this is a valid issue. The unfocused state should give the Tor button the same treatment as the toolbar, and right now the dark grey seems a little out of place since it's not doing what everything else is doing. Let's keep the text #FFFFFF but have it at 40% opacity when window is not in focus.

[stephendonner]

cc @fallaciousreasoning @petemill

[GeetaSarvadnya]

Looks like macOS specific issue, Not reproducible on Windows 10 x64

[fallaciousreasoning]

Doesn't reproduce on Linux either