Dont pass undefined as boolean

For #81574

src/vs/workbench/browser/parts/compositePart.ts

@@ -168,7 +168,7 @@ export abstract class CompositePart<T extends Composite> extends Part {
 		// Instantiate composite from registry otherwise
 		const compositeDescriptor = this.registry.getComposite(id);
 		if (compositeDescriptor) {
-			const compositeProgressIndicator = this.instantiationService.createInstance(CompositeProgressIndicator, this.progressBar, compositeDescriptor.id, isActive);
+			const compositeProgressIndicator = this.instantiationService.createInstance(CompositeProgressIndicator, this.progressBar, compositeDescriptor.id, !!isActive);
 			const compositeInstantiationService = this.instantiationService.createChild(new ServiceCollection(
 				[IEditorProgressService, compositeProgressIndicator] // provide the editor progress service for any editors instantiated within the composite
 			));