Update UILoader.

Author: gk-brown

sierra-test/src/main/java/org/httprpc/sierra/test/PreviewTest.java

@@ -22,6 +22,7 @@
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
 
 import static org.httprpc.kilo.util.Collections.*;
 
@@ -45,7 +46,7 @@ public void run() {
 
                 for (var i = 0; i < n; i++) {
                     try (var inputStream = GreetingTest.class.getResourceAsStream(names.get(i))) {
-                        Files.copy(inputStream, paths.get(i));
+                        Files.copy(inputStream, paths.get(i), StandardCopyOption.REPLACE_EXISTING);
                     }
                 }
 

sierra/src/main/java/org/httprpc/sierra/UILoader.java

@@ -834,7 +834,7 @@ private URL getURL(String value) {
         if (owner != null) {
             return owner.getClass().getResource(value);
         } else {
-            var uri = path.getParent().resolve(value).toUri();
+            var uri = path.resolveSibling(value).toUri();
 
             try {
                 return uri.toURL();