Fix notification modal description and textual button color in dark mode - follow up to #27004

[kjozwiak]

Description

Looking at https://github.com/brave/brave-core/pull/16128/files, it doesn't look like any changes were added into the PR that fixes the colour issue(s) discussed via #27004 (comment). When launching Brave for the first time on Android 13, the modal looks the same as before. We need to make sure it we're using the correct colours.

Steps to reproduce

Prerequisite: ensure that you're using dark mode via Android 13 before launching Brave.

Test Case #1

1. install 1.49.20 Chromium: 109.0.5414.87 using Android 13
2. run through the initial on-boarding and notice that the notification panel looks the same as before and is hard to read

Test Case #2

1. install 1.49.20 Chromium: 109.0.5414.87 using Android 13
2. run through the initial on-boarding and enable notifications
3. go into Settings -> Notifications and disable all notifications from the Notifications page
4. tap on <- (back button) and go back to the Settings page (notice the general warning is also using the incorrect colours)

Actual result

Example	Example

Expected result

Should be using the scheme mentioned via #27004 (comment) and look like https://www.figma.com/file/sdVBBufbl2A11hAgPNfyqG/Android-13-Notifications?node-id=1243%3A31639&t=7Pd5NQyY0I0HjTn0-1. @sujitacharya2005 also added a screenshot of how it was supposed to look via brave/brave-core#16128 (comment).

Issue reproduces how often

100% reproducible using the STR/Cases outlined above.

Version/Channel Information:

• Can you reproduce this issue with the current Play Store version? Yes
• Can you reproduce this issue with the current Play Store Beta version? Yes
• Can you reproduce this issue with the current Play Store Nightly version? Yes

Device details

• Install type (ARM, x86): ARM
• Device type (Phone, Tablet, Phablet): Pixel 6 (Phone)
• Android version: Android 13

Brave version

Brave | 1.49.22 Chromium: 109.0.5414.87 (Official Build) canary (32-bit)
--- | ---
Revision | 2dc18eb511c56e012081b4abc9e38c81c885f7d4-refs/branch-heads/5414@{#1241}
OS | Android 13; Build/T2B1.221118.006

Website problems only

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

Additional information

CCing @deeppandya @timchilds @sujitacharya2005

[deeppandya]

@sujitacharya2005 we need to uplift the change to 1.47

[kjozwiak]

The above requires 1.47.176 or higher for 1.47.x verification 👍

[Uni-verse]

Verified on Samsung Galaxy S21 using version:

Brave	1.47.181 Chromium: 109.0.5414.87 (Official Build) (64-bit) 
Revision	2dc18eb511c56e012081b4abc9e38c81c885f7d4-refs/branch-heads/5414@{#1241}
OS	Android 13; Build/TP1A.220624.014

Prerequisite: ensure that you're using dark mode via Android 13 before launching Brave.

Test Case #1

1. Install 1.47.181 using Android 13
2. run through the initial on-boarding and notice that the notification panel looks the same as before and is hard to read

Test Case #2

1. Install 1.48.171 using Android 13
2. run through the initial on-boarding and enable notifications
3. go into Settings -> Notifications and disable all notifications from the Notifications page
4. tap on <- (back button) and go back to the Settings page (notice the general warning is also using the incorrect colours)

Example	Example