test-js: Use prettier and format all files

Author: https://github.com/mattco98
Commit: 6d58c48c2f
Pull-request: https://github.com/SerenityOS/serenity/pull/2689
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/comments-basic.js

@@ -1,6 +1,5 @@
 test("regular comments", () => {
-    const source =
-`var i = 0;
+  const source = `var i = 0;
 
 // i++;
 /* i++; */
@@ -9,17 +8,16 @@ i++;
 */
 return i;`;
 
-    expect(source).toEvalTo(0);
+  expect(source).toEvalTo(0);
 });
 
 test("html comments", () => {
-    const source =
-`var i = 0;
+  const source = `var i = 0;
 <!-- i++; --> i++;
 <!-- i++;
 i++;
 --> i++;
-return i;`
+return i;`;
 
-    expect(source).toEvalTo(1);
+  expect(source).toEvalTo(1);
 });