[Android] Apply tinting for Import/Export password manager icons

[Olipro]

Previously, the import/export icons were not correctly tinted when the Android OS was set to dark mode.

To correct this, the icons no longer use a hard-coded fill colour and an iconTint property is applied in order to leverage the built-in support that Chromium has for automatically adjusting icons for light/dark mode.

Resolves brave/brave-browser#50232

[github-actions]

The security team is monitoring all repositories for certain keywords. This PR includes the word(s) "password" and so security team members have been added as reviewers to take a look.

No need to request a full security review at this stage, the security team will take a look shortly and either clear the label or request more information/changes.

Notifications have already been sent, but if this is blocking your merge feel free to reach out directly to the security team on Slack so that we can expedite this check.

[Olipro]

Previews:

[Olipro]

@aguscruiz @fallaciousreasoning - Would either of you mind giving the diff a quick check to see if the colours are as expected? If not, let me know what to change to.

[aguscruiz]

Looks ok to me, would you mind also posting a screenshot on how it looks when dynamic theming colors are enabled?

[aguscruiz]

Unrelated, I see the icons being used are from material design icons. The figma file has the correct icons to use.
https://www.figma.com/design/vHUet2idQQeyhANlnLaaOJ/Import-passwords?node-id=1-2

[Olipro]

Looks ok to me, would you mind also posting a screenshot on how it looks when dynamic theming colors are enabled?

@aguscruiz a rather trivial question: How would I configure this on a Google Pixel 10 device in order to test it?

[fallaciousreasoning]

Enable chrome://brave-android-dynamic-colors and then change the OS theme 😄

[aguscruiz]

Enable chrome://brave-android-dynamic-colors and then change the OS theme 😄

This, and you'll notice the different parts of the browser will be tinted depending on your Android color themes

[Olipro]

resolved on Slack

[brave-builds]

Released in v1.86.22

[hffvld]

Verified on Pixel 6 using version(s):

Device/OS: Pixel 6 / oriole-user 15 BP1A.250505.005 release-keys
Brave build: 1.86.22 
Chromium: 142.0.7444.60 (Official Build) canary (64-bit)

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STEPS:

1. Follow the STR/TP from [Follow-up to #35729] Import and Export icons don't respect device Dark mode brave-browser#50232 (comment) and [Android] Apply tinting for Import/Export password manager icons #32099 (comment)
2. Verify

ACTUAL RESULTS:

• Verified that Import passwords and Export passwords icons are shown properly in Dark mode and Light mode.
• Verified that Import passwords and Export passwords icons use correct design from Figma

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