fix: add vendor prefix for file tab styling

[jyash97]

What kind of change does this PR introduce?
Styling issue in firefox

What is the current behavior?
File tab on editor requires a firefox prefix for min-width

What is the new behavior?

What steps did you take to test this?

• Checked the developer tools which was saying invalid property, than checked the browser compatibility over here
• Tested it over localhost:3000 on both chrome and firefox

Checklist:

• Documentation - N/A
• Testing
• Ready to be merged
• Added myself to contributors table - N/A

Using CodeSandbox for more than a year. Really awesome work guys 💯

[SaraVieira]

Hey!!

Thank you so much for yout help :)

This is awesome

[SaraVieira]

@all-contributors bot please add @jyash97 for code

[allcontributors]

@SaraVieira

I've put up a pull request to add @jyash97! 🎉