Ads are not blocked for --variations-server-url and --variations-insecure-server-url

[btlechowski]

Follow up to: #23336

Steps to Reproduce

1. Clean profile
2. Run Brave with:

'--variations-server-url=https://www.google.com'
`--variations-server-url=https://variations.brave.com/seed`
--variations-insecure-server-url=http://localhost

1. Enable rewards and ads
   1.. Trigger an ad

Actual result:

Ads are shown

Expected result:

Ads are blocked

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	1.42.74 Chromium: 103.0.5060.134 (Official Build) beta (64-bit)
Revision	a1c2360c5b02a6d4d6ab33796ad8a268a6128226-refs/branch-heads/5060@{#1124}
OS	Ubuntu 18.04 LTS

cc @jsecretan @tmancey @brave/qa-team

[tmancey]

Closing as invalid. I have now updated the test case for brave/brave-core#13695