Avoid gl_ClipDistance in geometry shader

[ffreyer]

Description

Fixes #4148

Based on some testing with Simon the cause of the issue seems to be gl_ClipDistance being used in a geometry shader. This pr replaces that with just not generating scatter geometry. That is equivalent to what the previous implementation did, in effect, as clipping was/is only based on the scatter position.

This is a bit different from the version Simon tested so it needs to be checked again. (Who knows, maybe WSL also doesn't like geometry shaders not generating geometry)

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist

• [x] Added an entry in CHANGELOG.md (for new features and breaking changes)
• [ ] Added or changed relevant sections in the documentation
• [ ] Added unit tests for new algorithms, conversion methods, etc.
• [ ] Added reference image tests for new plotting functions, recipes, visual options, etc.