LibJS: Indent tests with 4 spaces instead of 2

Author: https://github.com/mattco98
Commit: 1ef573eb30
Pull-request: https://github.com/SerenityOS/serenity/pull/2689
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/operators/instanceof-basic.js

@@ -1,24 +1,24 @@
 test("basic functionality", () => {
-  function Foo() {
-    this.x = 123;
-  }
+    function Foo() {
+        this.x = 123;
+    }
 
-  const foo = new Foo();
-  expect(foo instanceof Foo).toBeTrue();
+    const foo = new Foo();
+    expect(foo instanceof Foo).toBeTrue();
 });
 
 test("derived ES5 classes", () => {
-  function Base() {
-    this.is_base = true;
-  }
+    function Base() {
+        this.is_base = true;
+    }
 
-  function Derived() {
-    this.is_derived = true;
-  }
+    function Derived() {
+        this.is_derived = true;
+    }
 
-  Object.setPrototypeOf(Derived.prototype, Base.prototype);
+    Object.setPrototypeOf(Derived.prototype, Base.prototype);
 
-  const d = new Derived();
-  expect(d instanceof Derived).toBeTrue();
-  expect(d instanceof Base).toBeTrue();
+    const d = new Derived();
+    expect(d instanceof Derived).toBeTrue();
+    expect(d instanceof Base).toBeTrue();
 });