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-scopes.js

@@ -1,18 +1,18 @@
 test("var in for head", () => {
-  for (var v = 5; false; );
-  expect(v).toBe(5);
+    for (var v = 5; false; );
+    expect(v).toBe(5);
 });
 
 test("let in for head", () => {
-  for (let l = 5; false; );
-  expect(() => {
-    l;
-  }).toThrowWithMessage(ReferenceError, "'l' is not defined");
+    for (let l = 5; false; );
+    expect(() => {
+        l;
+    }).toThrowWithMessage(ReferenceError, "'l' is not defined");
 });
 
 test("const in for head", () => {
-  for (const c = 5; false; );
-  expect(() => {
-    c;
-  }).toThrowWithMessage(ReferenceError, "'c' is not defined");
+    for (const c = 5; false; );
+    expect(() => {
+        c;
+    }).toThrowWithMessage(ReferenceError, "'c' is not defined");
 });