Ads will not be served on clean profile till browser restart after few page reloads

[btlechowski]

With no variation seed it is possible to lose user activity score but not gain it.
All new users will be affected till browser restart.
We need to tweak our default values.

Note: after score timeout is reached, the score is reset to 0

Steps to Reproduce

1. Clean profile
2. Run Brave
3. Enable rewards and ads
4. Open brave://welcome
5. Reload brave://welcome 5 times (using F5)

Actual result:

User activity goes below zero, but can't increase it therefor no ads are shown

[32234:32234:0419/161820.902780:VERBOSE2:permission_rule_util.cc(25)] User was inactive
[32234:32234:0419/161820.902965:VERBOSE1:notification_ad_serving.cc(106)] Notification ad not served: Not allowed due to permission rules
[32234:32234:0419/161820.965328:VERBOSE1:browser_manager.cc(120)] Browser did resign active
[32234:32234:0419/161820.967812:VERBOSE6:user_activity_manager.cc(49)] Triggered event: 17 (-2:0:900 s)

[32234:32234:0419/161841.263945:VERBOSE6:user_activity_manager.cc(49)] Triggered event: 11 (-2:0:900 s)
[32234:32234:0419/161841.298041:VERBOSE2:permission_rule_util.cc(25)] User was inactive
[32234:32234:0419/161841.298821:VERBOSE1:new_tab_page_ad_serving.cc(62)] New tab page ad not served: Not allowed due to permission rules

Expected result:

User is able to view the ads on clean install

Reproduces how often:

Easily reproduced

Version/Channel Information:

Brave	1.51.96 Chromium: 112.0.5615.121 (Official Build) beta (64-bit)
Revision	39cc4e45904ae9f1741c4fbaa866e629c96f2268-refs/branch-heads/5615_51@{#8}
OS	Ubuntu 18.04 LTS

cc @tmancey @aseren @iambrianfung @rebron

[tmancey]

This is working as expected, I will reach out in DM

[tmancey]

Closing, please see DM. Thanks