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/loops/for-basic.js

@@ -1,15 +1,15 @@
 test("basic functionality", () => {
-  let a = [];
-  for (let i = 0; i < 3; ++i) {
-    a.push(i);
-  }
-  expect(a).toEqual([0, 1, 2]);
+    let a = [];
+    for (let i = 0; i < 3; ++i) {
+        a.push(i);
+    }
+    expect(a).toEqual([0, 1, 2]);
 });
 
 test("only condition", () => {
-  let a = [];
-  for (; a.length < 3; ) {
-    a.push("x");
-  }
-  expect(a).toEqual(["x", "x", "x"]);
+    let a = [];
+    for (; a.length < 3; ) {
+        a.push("x");
+    }
+    expect(a).toEqual(["x", "x", "x"]);
 });