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/var-multiple-declarator.js

@@ -1,8 +1,8 @@
 test("basic functionality", () => {
-  var a = 1,
-    b = 2,
-    c = a + b;
-  expect(a).toBe(1);
-  expect(b).toBe(2);
-  expect(c).toBe(3);
+    var a = 1,
+        b = 2,
+        c = a + b;
+    expect(a).toBe(1);
+    expect(b).toBe(2);
+    expect(c).toBe(3);
 });