Removing Bitcoin.com NTP settings item

[ryanml]

Fixes brave/brave-browser#12759

Submitter Checklist:

• There is a ticket for my issue.
• Used Github auto-closing keywords in the commit message.
• Wrote a good PR/commit description
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally: npm run test -- brave_browser_tests, npm run test -- brave_unit_tests, npm run lint, npm run gn_check, npm run tslint
• Ran git rebase master (if needed).
• Requested a security/privacy review as needed.

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on.
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

Defined in issue

[kjozwiak]

test-browser failed on macOS due to several reward failures as per https://ci.brave.com/job/pr-brave-browser-sync-crash-1.18-macos/1/execution/node/251/log/. However, the reward failures are not related to this specific PR hence not blocking uplift.

12:04:05  3 tests failed:
12:04:05      RewardsBrowserTest.UpholdLimitNoBAT (../../brave/components/brave_rewards/browser/test/rewards_browsertest.cc:399)
12:04:05      RewardsPromotionBrowserTest.ClaimViaPanel (../../brave/components/brave_rewards/browser/test/rewards_promotion_browsertest.cc:203)
12:04:05      RewardsPromotionBrowserTest.PromotionRemovedFromEndpoint (../../brave/components/brave_rewards/browser/test/rewards_promotion_browsertest.cc:232)

test-browser failed on Win x64 due to several reward failures as per https://ci.brave.com/job/pr-brave-browser-sync-crash-1.18-windows/1/execution/node/247/log/. However, the reward failures are not related to this specific PR hence not blocking uplift.

12:40:10  2 tests failed:
12:40:10      RewardsBrowserTest.ActivateSettingsModal (../../brave/components/brave_rewards/browser/test/rewards_browsertest.cc:121)
12:40:10      RewardsContributionBrowserTest.TipConnectedPublisherVerified (../../brave/components/brave_rewards/browser/test/rewards_contribution_browsertest.cc:587)
12:40:10  1 test timed out:
12:40:10      RewardsBrowserTest.BackupRestoreModalHasNotice (../../brave/components/brave_rewards/browser/test/rewards_browsertest.cc:305)
12:40:10  1 test crashed:
12:40:10      RewardsBrowserTest.ToggleAutoContribute (../../brave/components/brave_rewards/browser/test/rewards_browsertest.cc:132)

[kjozwiak]

Uplift into 1.18.x approved after deliberating with @brave/uplift-approvers.