Fix Brave Logo usages in widgets in dark mode

[kylehickinson]

Description:

The top news list widgets and top news lock screen widget use an inversed monochrome brave logo which is the wrong usage of the logo

[hffvld]

Verified on iPhone 14 using version(s):

Device/OS: iPhone 14 / iOS 17.2
Brave build: 1.61 (23.12.7.20)
BraveCore: 1.61.101 (120.0.6099.71)

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Fresh install

STEPS:

1. Fresh install Brave
2. Go to the device home screen > Add shortcut
3. Add Brave News shortcuts > Verify

ACTUAL RESULTS:

• Verified that Brave logo has proper color on all widgets
• Verified the same in the Light and Dark mode

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Light Mode	Dark Mode

Upgrade install

STEPS:

1. Install Brave 1.60
2. Go to the device home screen > Add shortcut
3. Add Brave News shortcuts > Observe the issue with the News widget
4. Upgrade Brave to 1.61 build > Verify

ACTUAL RESULTS:

• Verified that Brave logo has proper color on all widgets
• Verified the same in the Light and Dark mode

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Light Mode 1.60	Light Mode 1.61	Dark Mode 1.60	Dark Mode 1.61