[bug]: Authorization header is missing prefix for Basic authentication

[wiebecommajonas]

Describe the bug
When trying to use Basic authentication, the generated Authorization header is missing the "Basic " prefix. For reference see mdn web docs

To Reproduce
Steps to reproduce the behavior:

1. In any request, go to the Auth tab
2. Select "Basic"
3. Enter credentials
4. Go to Headers tab and look at the generated Authorization header

Expected behavior
Generated header should be Authorization:Basic <credentials>

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: macOS
• Browser: Safari
• Version: 18.5