Follow up to #18858 - Clicking Solve on adaptive captcha Brave Ads paused modal sometimes yields no action

[btlechowski]

Follow up to #18858

Issue is still reproducible on Linux

Steps to Reproduce

1. Clean profile
2. Run Brave
3. Enable Rewards and Ads
4. Schedule a captcha for your payment ID
5. Trigger unblinded tokens refill
6. Minimize Brave
7. Click Solve

Actual result:

Browser is brought to foreground but captcha is not shown.

Note: User will have another try when unblinded tokens are scheduled to be refilled

Expected result:

The captcha is shown.

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	1.33.83 Chromium: 96.0.4664.45 (Official Build) beta (64-bit)
Revision	76e4c1bb2ab4671b8beba3444e61c0f17584b2fc-refs/branch-heads/4664@{#947}
OS	Ubuntu 18.04 LTS

cc @emerick @tmancey @jsecretan @brave/legacy_qa @rebron