Fix vertical alignment of dropdown in navbar

[MewenLeHo]

Related issues

Closes #1607

Description

Fix vertical alignment.

Motivation & Context

Fix vertical alignment.

Types of change

• Bug fix (non-breaking which fixes an issues)

Live previews

https://deploy-preview-1625--boosted.netlify.app/docs/5.2/components/dropdowns/#dark-dropdowns

Checklist

• I have read the contributing guidelines
• My code follows the code style of the project (using npm run lint)
• My change introduces changes to the documentation
• My change introduces changes to the migration guide
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

[netlify]

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[MewenLeHo]

Since it's a navbar example I kept the fix with the logo:

Do you prefer the fix without the logo?

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[julien-deramond]

LGTM. I'll create 2 separate PRs based on my comments.