Change Password Manager tab icon to match Brave brand

[Brave-Matt]

Description

The icon on the password manager tab looks like it was pulled straight from Chrome/Chromium — even through Chrome's does look slightly different (both shown below). The icon in the tab should match the rest of the Brave brand.

Icon in Brave:

Icon in Chrome:

[rebron]

cc: @aguscruiz

[aguscruiz]

@fallaciousreasoning we should use the same one we have in the menu here 👀

[fallaciousreasoning]

The one in the menu looks a little odd next to our other icons, as it doesn't have much height and looks a wee bit small:

Do you think the key-lock icon is better?
https://nala.bravesoftware.com/icons/key-lock.svg

[fallaciousreasoning]

I also feel like it doesn't look great as an installed app icon:

[fallaciousreasoning]

Just to prove I'm not and should never be a designer, what about something like this:

(I'm using the release gradient for the background --leo-gradient-brave-release)

[aguscruiz]

Ugh, I didn't know you could install it as a web app and it'd look THAT big hah. I think the one in the tab is ok. But I'll have to spend more time with the big one.

I'll put it in my backlog for now, is that ok?

[fallaciousreasoning]

@aguscruiz's much nicer icon:

[fallaciousreasoning]

Exported the wrong layer - actual icon is this:

[stephendonner]

Verification PASSED using

Brave | 1.62.52 Chromium: 119.0.6045.134 (Official Build) nightly (x86_64)
-- | --
Revision | f73c8c1e096256f71307b56c8f7180fc85028d85
OS | macOS Version 11.7.10 (Build 20G1427)

Confirmed the new key icon is very "Bravey", in all the places I knew to check

Install app? prompt	brave://settings/autofill	brave://settings/autofill	brave://password-manager/passwords	brave://password-manager/passwords

Key icon	Finder icon