Fix plane position and normal constructor

[AnyOldName3]

It wouldn't actually compile, but thanks to SFINAE, it wasn't emitting an error unless you actually tried using it, which apparently nothing was. The initialiser wanted to receive a float, but because VSG's operator* works component-wise, it was getting a vector. I assume this was just an oversight when copying stuff from OSG where operator* is a dot product.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

vsg::plane reflectionPlane(vsg::vec3(0.0f, 5.0f, 0.0f), vsg::vec3(0.0f, -1.0f, 0.0f));

This line previously wouldn't compile, and now it does.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules