Graphics/Shaders: Adjust PBR ambient

src/Nazara/Graphics/Resources/Shaders/PhysicallyBasedMaterial.nzsl

@@ -234,7 +234,7 @@ fn main(input: VertToFrag) -> FragOut
 			lightRadiance += shadowFactor * radiance;
 		}
 
-		let ambient = (0.03).rrr * albedo;
+		let ambient = (0.0001).rrr * albedo;
 
 		let color = ambient + lightRadiance * color.rgb;
 		color = color / (color + vec3[f32](1.0, 1.0, 1.0));