LibWeb: Fire the change event synchronously when committing changes

The spec does not say to do this asynchronously on a task queue.

Tests/LibWeb/Text/input/input-commit.html

@@ -1,12 +1,11 @@
 <input id=input type=text>
 <script src="include.js"></script>
 <script>
-    asyncTest((done) => {
+    test(() => {
         let input = document.getElementById("input");
 
         input.addEventListener("change", () => {
             println(input.value);
-            done();
         });
 
         internals.sendText(input, "wfh :^)");