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/while-basic.js

@@ -1,19 +1,19 @@
 test("basic functionality", () => {
-  let number = 0;
-  while (number < 9) {
-    number++;
-  }
-  expect(number).toBe(9);
+    let number = 0;
+    while (number < 9) {
+        number++;
+    }
+    expect(number).toBe(9);
 });
 
 test("no braces", () => {
-  let number = 0;
-  while (number < 3) number++;
-  expect(number).toBe(3);
+    let number = 0;
+    while (number < 3) number++;
+    expect(number).toBe(3);
 });
 
 test("does not loop when initially false", () => {
-  while (false) {
-    expect().fail();
-  }
+    while (false) {
+        expect().fail();
+    }
 });