replaced abibuilder.informatik with abibuilder.cs

[greengypsy]

Describe the change

Replaced "abibuilder.informatik" with "abibuilder.cs"

PR checklist

• [ ] I have added description of the change I'm proposing in the OpenMS Documentation.
• [ ] I have read and followed OpenMS Documentation Contributing guidelines.
• [ ] I have attached a screenshot of the relevant area after this change.
• [ ] CHANGELOG.md is updated.
• [ ] I have added my name in CONTRIBUTING.md.