LibJS: Uncomment the tests that pass now

Author: https://github.com/Cleverking2003
Commit: 1dbd264239
Pull-request: https://github.com/SerenityOS/serenity/pull/4622
Issue: https://github.com/SerenityOS/serenity/issues/4543

Libraries/LibJS/Tests/builtins/Math/Math.log2.js

@@ -2,10 +2,9 @@ test("basic functionality", () => {
     expect(Math.log2).toHaveLength(1);
 
     expect(Math.log2(3)).toBeCloseTo(1.584962500721156);
-    // FIXME: not precise enough
-    // expect(Math.log2(2)).toBe(1);
-    // expect(Math.log2(1)).toBe(0);
+    expect(Math.log2(2)).toBe(1);
+    expect(Math.log2(1)).toBe(0);
     expect(Math.log2(0)).toBe(-Infinity);
     expect(Math.log2(-2)).toBe(NaN);
-    // expect(Math.log2(1024)).toBe(10);
+    expect(Math.log2(1024)).toBe(10);
 });