fix(antd): Invalid dashed border in tertiary button

[justinpark]

SUMMARY

During the migration process of Ant Design 5 (antd5) buttons here, the border style of the tertiary button was incorrectly applied as dashed, which differs from the intended design.

suggested	actual

Although this issue was resolved on the current master branch with PR #31972, the fix was not included in the 5.0 release. To address this, this commit applies this correction.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before	After

TESTING INSTRUCTIONS

Go to a chart explore and then check the menu action button

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[korbit-ai]

I've completed my review and didn't find any issues.

Files scanned

​

File Path	Reviewed
superset-frontend/src/components/Button/index.tsx	✅

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[mistercrunch]

LGTM!