[QLC+ 5] Channel settings for fixtures shows each device type only once

[DunklerPhoenix]

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Describe the bug Fixtures of the same type can't be edited after they got added to the viewer. The edit window show always only one and I can only edit one of them (often the last)

To Reproduce Steps to reproduce the behavior:

1. Add two fixtures of the same type
2. Move them in the Universe View a bit apart from each other
3. Select one in the fixture groups
4. Click edit button
5. See only one of the fixtures

Expected behavior Each added fixture should be visible here. Then I can set one fixture of e.g. the LED Strobe to 13 CH and the other to 54 CH.

Screenshots

Desktop (please complete the following information):

• OS: Linux (Ubuntu)
• QLC+ Version: qlcplus-qt5qml-5.0.0_Beta_3-20240928-a76affd