LibGL+LibSoftGPU: Enumize material front/back face selection

Author: https://github.com/gmta
Commit: 3609ffc450
Pull-request: https://github.com/SerenityOS/serenity/pull/11960
Reviewed-by: https://github.com/Quaker762 ✅

Userland/Libraries/LibSoftGPU/Device.cpp

@@ -1143,9 +1143,9 @@ void Device::set_light_state(unsigned int light_id, Light const& light)
     m_lights.at(light_id) = light;
 }
 
-void Device::set_material_state(unsigned int material_id, Material const& material)
+void Device::set_material_state(Face face, Material const& material)
 {
-    m_materials.at(material_id) = material;
+    m_materials[face] = material;
 }
 
 void Device::set_raster_position(RasterPosition const& raster_position)