LibJS: Uncomment passing tests

Userland/Libraries/LibJS/Tests/builtins/Symbol/Symbol.prototype.valueOf.js

@@ -1,11 +1,11 @@
 test("basic functionality", () => {
     const local = Symbol("foo");
-    // const global = Symbol.for("foo");
+    const global = Symbol.for("foo");
     expect(local.valueOf()).toBe(local);
-    // expect(global.valueOf()).toBe(global);
+    expect(global.valueOf()).toBe(global);
 
     expect(Symbol.prototype.valueOf.call(local)).toBe(local);
-    // expect(Symbol.prototype.valueOf.call(global)).toBe(global);
+    expect(Symbol.prototype.valueOf.call(global)).toBe(global);
 });
 
 test("|this| must be a symbol", () => {

Userland/Libraries/LibJS/Tests/syntax/optional-chaining.js

@@ -10,8 +10,7 @@ test("parse optional-chaining", () => {
     expect("a?.b?.``").not.toEval();
     expect("new Foo?.bar").not.toEval();
     expect("new (Foo?.bar)").toEval();
-    // FIXME: This should pass.
-    // expect("(new Foo)?.bar").toEval();
+    expect("(new Foo)?.bar").toEval();
 });
 
 test("evaluate optional-chaining", () => {