Fix New Tabs Page display for RTL Languages

[imptrx]

Changes

• Change margins for clock and stats widgets so RTL is supported (Addresses Issue: Fix clock and stats padding for right-to-left languages on the New Tab Page brave-browser#3574)
• Quick View:
  

Test plan

For testing with brave-core

• Launch brave while system locale is LTR (English), and RTL (Arabic, Hebrew)
• Open new tabs page and widgets should not be flush with edge
• Resize window to check for responsive behavior

For testing with storybook

• Manually edit enclosing html for new tabs page feature with attribute dir="rtl"

Link / storybook path to visual changes

• http://localhost:9091/?path=/story/feature-components-new-tab-default--page

Integration

• Does this contain changes to src/components or src/

  • Will you publish to npm immediately after this PR, or wait until sometime in the future?
  • Incompatible API change to something existing (major version increase)
  • Adding new backwards-compatible functionality? (minor version increase)
  • Fixing a bug backwards-compatibly? (patch version increase)

• Does this contain changes to src/features for brave-core?

  • Are there non backwards-compatible changes required for brave-core? Do not merge until brave-core PR is approvable. Link to brave-core PR:
  • Will you create brave-core PR to update to this commit after it is merged?
  • Wants uplift to brave-core feature branch?
    • When uplift-approved, merge to brave-core-0.VV.x feature branch
    • Create additional brave-core PRs for each feature branch to update commit

[cezaraugusto]

++ thanks Peter!