Proposed changes

The pull request changes the parameter usage in the DELETE request of the {id}/sources/delete endpoint in the SoundController. With the current implementation there is the problem that it requires the complete SoundFileSourceDTO to get the id from it. This is a bit stupid and requires more data which must be send over the network.

So this pull request changes the required parameter to the id from the model which is must better for the network and reduces complexity.

Types of changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of
them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before
merging your code.

• I have read the CONTRIBUTING.md
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)