selecting SE from on-boarding doesn't select the correct SE

[kjozwiak]

Description

Launch Brave with a locale that has the SE on-boarding modal enabled and you'll notice that both the Standard & Private SE's are not what was selected from on-boarding. I reproduced the issue with both the Spain & Poland locales.

It appears like the selection from the list is incorrectly mapped and another SE is being selected.

Steps to reproduce

Prerequisite: ensure that you're using a locale that still has the SE on-boarding enabled. I used Spain & Poland

1. launch 1.32.66 Chromium: 95.0.4638.40 (used Poland as the locale for this case)
2. skip through all the initial on-boarding and tap on the URL
3. select Qwant as the default SE via the on-boarding modal
4. DDG is set as the default SE for both Standard & Private windows/tabs

Actual result

DDG is being selected as the default SE rather than the selected Qwant

Expected result

Users selected SE should be set as the default for both Standard & Private

Issue reproduces how often

100% reproducible using the above STR.

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): Samsung S10+
• Android version: Android 11

Brave version

• 1.32.66 Chromium: 95.0.4638.40 - Reproduced
• 1.30.89 Chromium: 94.0.4606.81 - Reproduced

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 @bsclifton @rebron @brave/legacy_qa

[srirambv]

Verification passed on Oppo Reno 5 with Android 11 running 1.31.88 x64 build

• Verified steps from issue description
• Verified selected SE from onboarding is set as default for both normal and private tabs