Revert "refactor: use bevy_sk PbrMaterial instead of StandardMaterial"

This reverts commit 7b126557df.

src/nodes/drawable/text.rs

@@ -92,10 +92,10 @@ fn spawn_text(
 				text: text_string,
 				material: material_registry.get_handle(
 					BevyMaterial {
-						color: style.color.to_bevy(),
-						emission_factor: Color::WHITE,
+						base_color: style.color.to_bevy(),
+						emissive: Color::WHITE.to_linear(),
 						metallic: 0.0,
-						roughness: 1.0,
+						perceptual_roughness: 1.0,
 						// If alpha is supported on text we need to change this
 						alpha_mode: AlphaMode::Opaque,
 						double_sided: false,