Fix audio bus effects not deselecting after switching focus in the editor

[Vinealius]

Make the appropriate selection of the effect on the audio bus.

• Select an effect on more than one Audio bus the other ones remains selected, so if you press the Delete key you can delete one effect selected at a time of each diferent Audio bus.

• Create a new node in the scene and create and select a Audio bus effect, then select the new scene node and press the Delete key to delete the node, the effect will be deleted instead.

• Fixes Visual bug : AudioEffect don't deselect if only one effect per bus #11355

[Calinou]

Thanks for opening a pull request!

Please amend the commit to use a human-readable commit message (git commit --amend). This way, people reading the Git log can easily figure out what's going on 🙂

[fire]

@Calinou is this ready to go? It's more of a usability rather than audio change.

[Calinou]

Tested locally (rebased on top of master 41365c6), it works as expected.

Before

Don't mind the stretching, I forgot to disable resizing in SimpleScreenRecorder and it ignores aspect ratio.

simplescreenrecorder-2023-12-13_00.07.01.mp4

After (this PR)

simplescreenrecorder-2023-12-13_00.06.26.mp4

[Calinou]

@Calinou is this ready to go? It's more of a usability rather than audio change.

I've force-pushed an updated commit message, so this should be good to merge now.

[YuriSizov]

Superseded by #85879. Thanks for your contribution nevertheless.