[Bug]: HTTPie Desktop sets default Content-Type header on operations

[echarpibm]

What happened?

HTTPie Desktop sets Content-Type header application/json on operations.

Some systems receiving the request will not allow an empty body on Content-Type set to application/json

For example Fastify will give an error: Body cannot be empty when content-type is set to 'application/json'

The workaround is to force a Content-Type header with text/plain as a value, but this should not be necessary.

Steps to reproduce?

1. Create a simple DELETE requests with no headers
2. Notice that the Desktop App set a header for `Content-Type`

Similar behaviour for a POST operation.

What did you expect to happen?

No header should automatically be set for any requests.

Platform

Windows

HTTPie Desktop version

2024.1.2

Relevant log output

No response

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