Fix command line Brave Ads permission rule - Follow up to 23336

[tmancey]

Description

Steps to Reproduce

1. Try to view an ad by launching the browser from the command-line with --rewards=staging=false to use the production environment

Actual result:

Ad is not served due to --enable-features command-line arg is not supported being shown in the console log

Expected result:

Ad should be served

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Version/Channel Information:

• Can you reproduce this issue with the current release? No
• Can you reproduce this issue with the beta channel? No
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• 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

Miscellaneous Information:

[btlechowski]

Verification passed on

Brave	1.42.65 Chromium: 103.0.5060.114 (Official Build) beta (64-bit)
Revision	a1c2360c5b02a6d4d6ab33796ad8a268a6128226-refs/branch-heads/5060@{#1124}
OS	Ubuntu 18.04 LTS

Verified that when --rewards=staging=false flag is used, ads are shown

[9766:9766:0721/115025.488322:VERBOSE1:eligible_notification_ads_v1.cc(38)] Get eligible notification ads:
[9766:9766:0721/115025.490653:VERBOSE1:eligible_notification_ads_v1.cc(161)] Get eligible ads for untargeted segment
[9766:9766:0721/115025.508705:VERBOSE2:priority.h(33)] 1 ads with a priority of 5 in bucket 1
[9766:9766:0721/115025.509022:VERBOSE1:eligible_notification_ads_v1.cc(181)] 1 eligible ads out of 1 ads for untargeted segment
[9766:9766:0721/115025.509422:VERBOSE1:notification_ad_serving.cc(142)] Found 1 eligible ads
[9766:9766:0721/115025.509617:VERBOSE1:notification_ad_serving.cc(251)] Serving notification ad:
  placementId: 8ec6d859-95fa-4275-9479-a92572dff196
  creativeInstanceId: c80153f6-cf22-41c0-8c2c-24c1f9a23c96
  creativeSetId: 58c1dcd9-24a4-4886-bf5d-4235c3074110
  campaignId: 5c00bdb5-a8b2-4290-b51d-96e5db2da195
  advertiserId: 602b6c48-d465-4530-a78f-4488ab88815d
  segment: untargeted
  title: Ledger Nano S
  body: The world’s most popular hardware wallet
  targetUrl: https://shop.ledger.com/products/ledger-nano-s?r=0ba5d7199327