Test: Start index counting from 1 for output

core/src/test/java/com/github/weisj/darklaf/core/test/DemoTest.java

@@ -82,7 +82,7 @@ class DemoTest implements NonThreadSafeTest {
     private void runDemo(final Theme theme, final Robot robot, final int count, final int index,
             final DemoLauncher.DemoEntry demo) {
         TestUtils.ensureLafInstalled(theme, true);
-        LOGGER.warning("Running: " + index + "/" + count + " " + demo);
+        LOGGER.warning("Running: " + (index + 1) + "/" + count + " " + demo);
         if (demo.isDelicate()) {
             LOGGER.warning("Skipping");
             return;