RenderShadowLodOrigin causes crash when not using PBR feature

[laundmo]

When not using the PBR feature, RenderShadowLodOrigin causes a panic:

Encountered an error in system `bevy_render::view::prepare_view_uniforms`:
  Parameter `Res<'_, RenderShadowLodOrigin>` failed validation: 
    Resource does not exist

When using bevy_render but not bevy_pbr. This affects all apps which just use the 2d feature set or a similar configuration of features which omits bevy_pbr.

Used here:

bevy/crates/bevy_render/src/view/mod.rs

Line 1013 in a0baf1a

shadow_lod_origin: Res<RenderShadowLodOrigin>,

Initialized here in PbrPlugin:

bevy/crates/bevy_pbr/src/lib.rs

Line 413 in a0baf1a

.init_resource::<RenderShadowLodOrigin>()

PbrPlugin uses feature bevy_pbr:

bevy/crates/bevy_internal/src/default_plugins.rs

Lines 78 to 79 in a0baf1a

	#[cfg(feature = "bevy_pbr")]
	bevy_pbr:::PbrPlugin,

System registered here in ViewPlugin which is added by RenderPlugin:

bevy/crates/bevy_render/src/view/mod.rs

Line 201 in a0baf1a

prepare_view_uniforms.in_set(RenderSystems::PrepareResources),

RenderPlugin uses feature bevy_render

bevy/crates/bevy_internal/src/default_plugins.rs

Lines 43 to 44 in a0baf1a

	#[cfg(feature = "bevy_render")]
	bevy_render:::RenderPlugin,

[laundmo]

ooof no template means no labels

[pcwalton]

#24359 is a fix