test-js: Use prettier and format all files

Author: https://github.com/mattco98
Commit: 6d58c48c2f
Pull-request: https://github.com/SerenityOS/serenity/pull/2689
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/builtins/Object/Object.js

@@ -1,8 +1,8 @@
 test("basic functionality", () => {
-    expect(Object).toHaveLength(1);
-    expect(Object.name).toBe("Object");
-    expect(Object.prototype.length).toBe(undefined);
+  expect(Object).toHaveLength(1);
+  expect(Object.name).toBe("Object");
+  expect(Object.prototype).not.toHaveProperty("length");
 
-    expect(typeof Object()).toBe("object");
-    expect(typeof new Object()).toBe("object");
+  expect(typeof Object()).toBe("object");
+  expect(typeof new Object()).toBe("object");
 });