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/program-strict-mode.js

@@ -1,18 +1,18 @@
 "use strict";
 
 test("basic functionality", () => {
-  expect(isStrictMode()).toBeTrue();
-
-  (function () {
     expect(isStrictMode()).toBeTrue();
-  })();
 
-  (() => {
-    expect(isStrictMode()).toBeTrue();
-  })();
+    (function () {
+        expect(isStrictMode()).toBeTrue();
+    })();
 
-  (() => {
-    "use strict";
-    expect(isStrictMode()).toBeTrue();
-  })();
+    (() => {
+        expect(isStrictMode()).toBeTrue();
+    })();
+
+    (() => {
+        "use strict";
+        expect(isStrictMode()).toBeTrue();
+    })();
 });