Struct API glms_ray_at incorrect dir param.

[nitrix]

Fixes what appears to me like an accidental copy-paste mistake with the dir parameter of the struct API for glms_ray_at().
Introduced in 73a4fc7 (v0.9.3), discovered during compilation by Clang warnings.

[build] ***/vendor/cglm/include/cglm/struct/ray.h:76:33: warning: unused parameter 'dir' [-Wunused-parameter]
[build] glms_ray_(at)(vec3s orig, vec3s dir, float t) {
[build]                                 ^
[build] 1 warning generated.

[recp]

Hi @nitrix,

Thanks for the catch and your contributions, the PR is merged 🚀