Fixes breaking dropdown arrow for AUD/KRW [Bitcoin.com widget]

[ryanml]

Fixes brave/brave-browser#11996

Left margin was excessive

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
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• Added/updated tests for this change (for new code or code which already has tests).
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• Added appropriate QA labels (QA/Yes or QA/No) to the associated issue
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• Public documentation has been updated as necessary. 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-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

Defined in issue

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

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.

[emerick]

LGTM

[srirambv]

Margin can be upto 2.5px so that other tokens KRW/KWD/TWD don't break

KWD breaks at 3px as well so having 2.5px fixes it for all

But having margin set to 2.5px causes other currencies like IDL/ILS/JPY/JOD to look odd