WebGPURenderer: Fix compileAsync() with target scenes.

Author: Mugen87

src/renderers/common/Renderer.js

@@ -930,7 +930,15 @@ class Renderer {
 
 		//
 
-		this._background.update( sceneRef, renderList, renderContext );
+		if ( targetScene !== scene ) {
+
+			this._background.update( targetScene, renderList, renderContext );
+
+		} else {
+
+			this._background.update( sceneRef, renderList, renderContext );
+
+		}
 
 		// process render lists