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-head-errors.js

@@ -1,23 +1,23 @@
 test("using undefined variable in initializer", () => {
-  expect(() => {
-    for (let i = foo; i < 100; ++i) {}
-  }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
+    expect(() => {
+        for (let i = foo; i < 100; ++i) {}
+    }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
 });
 
 test("using undefined variable in condition", () => {
-  expect(() => {
-    for (let i = 0; i < foo; ++i) {}
-  }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
+    expect(() => {
+        for (let i = 0; i < foo; ++i) {}
+    }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
 });
 
 test("using undefined variable in updater", () => {
-  let loopCount = 0;
+    let loopCount = 0;
 
-  expect(() => {
-    for (let i = 0; i < 100; ++foo) {
-      loopCount++;
-    }
-  }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
+    expect(() => {
+        for (let i = 0; i < 100; ++foo) {
+            loopCount++;
+        }
+    }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
 
-  expect(loopCount).toBe(1);
+    expect(loopCount).toBe(1);
 });