LibWeb: Update checkbox focus lost test

Author: https://github.com/Psychpsyo
Commit: https://github.com/LadybirdBrowser/ladybird/commit/3f5fff79ae0
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2501
Reviewed-by: https://github.com/tcl3 ✅

Tests/LibWeb/Text/expected/checkbox-focus-lost-no-change-event.txt

@@ -0,0 +1 @@
+PASS: Change event was not fired

Tests/LibWeb/Text/input/checkbox-focus-lost-no-change-event.html

@@ -2,8 +2,9 @@
 <input type="checkbox" id="checkbox">
 <script src="include.js"></script>
 <script>
+    let changeEventFired = false;
     checkbox.addEventListener("change", () => {
-      println("Change event was fired when it shouldn't have been.");
+      changeEventFired = true;
     });
     asyncTest(async done => {
         checkbox.focus();
@@ -11,6 +12,12 @@
         checkbox.blur();
         await new Promise(resolve => setTimeout(resolve, 0));
 
+        if (changeEventFired) {
+            println("FAIL: Change event was fired when it shouldn't have been.");
+        } else {
+            println("PASS: Change event was not fired");
+        }
+
         done();
     });
-</script>
+</script>