Adaptive captcha Brave Ads paused modal is shown when browser window is minimized

[btlechowski]

Follow up to #15600

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

Actual result:

Adaptive captcha Brave Ads paused modal stays visible

Expected result:

Adaptive captcha Brave Ads paused modal is hidden along with the browser window.

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	1.31.85 Chromium: 95.0.4638.50 (Official Build) (64-bit)
Revision	3e9db37693d0cf8e31a89fbcf50401ae91125cef-refs/branch-heads/4638@{#816}
OS	Ubuntu 18.04 LTS

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

[emerick]

You could have multiple browser windows open, so this might get a little bit complicated. Do we implement something similar with ads notifications?

[tmancey]

Multiple profiles should not show multiple ads. However, the solution would not work in this case. @jsecretan we should consider limiting rewards/ads to the users main profile. Your thoughts?