If you do not want accept in headers, but cannot delete it, it will be forced to set to */*

### Expected Behavior

Delete the accept header

### Actual Behavior

There is no way to delete accept

### Reproduction Steps

_No response_

### Is there an existing issue for this?

- [x] I have searched the [issue tracker](https://www.github.com/Kong/insomnia/issues) for this problem.

### Which sync method do you use?

- [ ] Git sync.
- [ ] Insomnia Cloud sync.
- [x] Local only

### Additional Information

_No response_

### Insomnia Version

11.6.1

### What operating system are you using?

macOS

### Operating System Version

macOS Sequoia 15.6.1

### Installation method

download for Insomnia

### Last Known Working Insomnia version

_No response_

Start by reproducing the request-header behavior in Insomnia 11.6.1 on macOS, focusing on the Accept header after attempting to delete it. Trace the relevant request editor behavior from there. Done means the Accept header can be removed and is not forced to */*.

Written by the indexing model from the issue text.