[studio] Add Content-Type response header to StudioAccessDeniedHandler

[yacdaniel]

Describe the bug

When a site is created using /api/1/site/create.json and the user doesn't have permissions to create a site the response doesn't contain the Content-Type header. This is causing some issues while using the craftercms CLI.

To Reproduce

Steps to reproduce the behavior:

1. Create a user and don't assign any group.
2. Create a site using /api/1/site/create.json with the previous user.
3. See response headers

Expected behavior

Content-Type: application/json should be returned in the header when user is not authorized. https://github.com/craftercms/studio/blob/develop/src/main/java/org/craftercms/studio/impl/v1/web/security/access/StudioAccessDeniedHandler.java

Screenshots

Logs

N/A

Specs

Version

3.1.x & 3.2.x

OS

Any

Browser

Any

Additional context

N/A

[dejan-brkic]

Done
PR:
craftercms/studio#2225
craftercms/studio#2226

[sumerjabri]

Validated in 3.1.x

[yacdaniel]

Verified fixed in 3.2.x