Fix deprecated URL constructor usage in JavaTestPlugin

Rely on bundle.getEntry to do the whole resolving rather than splitting
it in two.

Author: akurtakov

org.eclipse.jdt.debug.tests/test plugin/org/eclipse/jdt/debug/testplugin/JavaTestPlugin.java

@@ -89,7 +89,7 @@ private static void waitForAutoBuild()  {
 	public File getFileInPlugin(IPath path) {
 		try {
 			Bundle bundle = getDefault().getBundle();
-			URL installURL= new URL(bundle.getEntry("/"), path.toString());
+			URL installURL = bundle.getEntry("/" + path.toString());
 			URL localURL= FileLocator.toFileURL(installURL);//Platform.asLocalURL(installURL);
 			return new File(localURL.getFile());
 		} catch (IOException e) {