fix: don't use undefined behavior of smoothstep - #428
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The previous implementation calls smoothstep with edge0 < edge1. This is undefined behavior according to [the spec](https://registry.khronos.org/OpenGL-Refpages/gl4/html/smoothstep.xhtml) and the book's [glossary](https://github.com/patriciogonzalezvivo/thebookofshaders/blob/8fde956595fa90fe3cbb0239fc78c45aecb36d8f/glossary/smoothstep/README.md) This usage was introduced in PR patriciogonzalezvivo#245 and closes patriciogonzalezvivo#418.
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The previous implementation calls smoothstep with edge0 < edge1. This is undefined behavior according to the spec and the book's glossary
This usage was introduced in PR #245 and closes #418.