Fix: Corrected test descriptions for file widget attributes

[yuki-js]

Reasons for making this change

The descriptions for two tests in StringField.test.jsx were reversed.

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests. I've run npm run test:update to update snapshots, if needed.
  • I've updated docs if needed
  • I've updated the changelog with a description of the PR
• I'm adding a new feature
  • I've updated the playground with an example use of the feature

[heath-freenome]

Can you role these changes into your other PR since they are all related?

[yuki-js]

Okay, I thought was a independent issue of #4030, though I found it while working that. I will merge them into one if you prefer.