Delete RenderSettings on Renderer shutdown


Ownership of this backend node is transferred to the renderer but it was
never deleted.

Pick-to: 6.12 6.11 6.8
Change-Id: I6418d788de9de8437817802fdefeba8063eae918
Reviewed-by: Mike Krus <mike.krus@kdab.com>
commit711ce461e9a0ead63ad0a416a7b992cce450db7a
parent7a91ee0f2885b363c09267001529c86b511ae703
authorMauro Persano <mauro.persano@kdab.com>
committerMauro Persano <mauro.persano@kdab.com>
commit timeTue, 8 Sep 2026 10:51:20 +0000