bevy_pbr: Do not panic when more than 256 point lights are added to t…

…he scene

crates/bevy_pbr/src/render/light.rs

@@ -641,7 +641,7 @@ pub fn prepare_lights(
  }
 
  let mut gpu_point_lights = [GpuPointLight::default(); MAX_POINT_LIGHTS];
- for (index, &(entity, light)) in point_lights.iter().enumerate() {
+ for (index, &(entity, light)) in point_lights.iter().enumerate().take(MAX_POINT_LIGHTS) {
  let mut flags = PointLightFlags::NONE;
  // Lights are sorted, shadow enabled lights are first
  if light.shadows_enabled && index < MAX_POINT_LIGHT_SHADOW_MAPS {