update UniformDesc return type in Zig generator

[opzap]

A project failed to compile when I added runtime reflection to my shaders because sokol.gfx had no member named GlslShaderUniformDesc

the reflected type now matches the changes made in floooh/sokol@a120657 and floooh/sokol-zig@255e68f

[floooh]

Thanks! Oversight on my part (none of the sokol-zig samples use the reflection output, so that slipped through).

Btw, with the new resouce bindings changes, the dynamic reflection info might not be as critical as before because it's now possible to explicitly define bindslot locations, and also to have gaps in the bindslot ranges. E.g. it's now possible to use the same bindings across different shaders, even when those shaders don't use a speciifc binding.

[floooh]

Binaries will be updated when this CI pipeline goes green: https://github.com/floooh/sokol-tools/actions/runs/11870326860