cant delete filter on import source modifier

[MisterMountain]

Expected Behavior

When clicking "delete" it should actually delete the filter

Current Behavior

When clicking "delete" the filter does not get deleted

Steps to Reproduce (for bugs)

Create an filter for a modifier that gets a property from another import source

Your Environment

• Director version (System - About): 1.11.1
• Icinga Web 2 version and modules (System - About): 2.12.1 (with Netbox Module 3.6.2
• Icinga 2 version (icinga2 --version): 2.14.2
• Operating System and version: Debian Linux 12 bookworm
• Webserver, PHP versions: 8.2.20

https://github.com/user-attachments/assets/33016d3e-c49d-43a2-bb00-a1712dc971cf

[tectumopticum]

#2864