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/builtins/Number/Number.parseFloat.js

@@ -1,5 +1,5 @@
 test("basic functionality", () => {
-    // Ensuring it's the same function as the global
-    // parseFloat() is enough as that already has tests :^)
-    expect(Number.parseFloat).toBe(parseFloat);
+  // Ensuring it's the same function as the global
+  // parseFloat() is enough as that already has tests :^)
+  expect(Number.parseFloat).toBe(parseFloat);
 });