use correct classlaoder when validating glue

Author: Christoph Läubrich

io.cucumber.eclipse.java/src/io/cucumber/eclipse/java/runtime/CucumberRuntime.java

@@ -15,7 +15,6 @@
 import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
-import java.util.function.Supplier;
 
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IResource;
@@ -123,7 +122,7 @@ public void run(IProgressMonitor monitor, PrintStream stream) {
 						public Collection<? extends Backend> get() {
 							// TODO https://github.com/cucumber/cucumber-jvm/issues/2217
 							ThreadLocalObjectFactorySupplier supplier = new ThreadLocalObjectFactorySupplier(
-									new ObjectFactoryServiceLoader(()->this.getClass().getClassLoader(), options));
+									new ObjectFactoryServiceLoader(() -> classLoader, options));
 							ObjectFactory objectFactory = supplier.get();
 							Set<Backend> backends = Collections.singleton(
 									BACKEND_PROVIDER_SERVICE.create(objectFactory, objectFactory, () -> classLoader));