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/empty-statements.js

@@ -1,19 +1,19 @@
 test("empty semicolon statements", () => {
-  expect(";;;").toEval();
+    expect(";;;").toEval();
 });
 
 test("if with no body", () => {
-  expect("if (true);").toEval();
+    expect("if (true);").toEval();
 });
 
 test("chained ifs with no bodies", () => {
-  expect("if (false); else if (false); else;").toEval();
+    expect("if (false); else if (false); else;").toEval();
 });
 
 test("while with no body", () => {
-  expect("while (false);").toEval();
+    expect("while (false);").toEval();
 });
 
 test("do while with no body", () => {
-  expect("do; while (false);").toEval();
+    expect("do; while (false);").toEval();
 });