fix: allow optional parentheses in arrow function parameters for step 19 (freeCodeCamp#64714)

Co-authored-by: majestic-owl448 <[email protected]>

Author: ItsYash1421

curriculum/challenges/english/blocks/workshop-fruit-search-app/6813f4dc94d4a31c5702f594.md

@@ -16,7 +16,7 @@ You should update `setResults` with `data.map(fruit => fruit.name)`.
 ```js
 assert.match(
   code,
-  /setResults\s*\(\s*data\.map\(\s*\w+\s*=>\s*\w+\.name\s*\)\s*\)/s
+  /setResults\s*\(\s*data\.map\(\s*(?:\(\w+\)|\w+)\s*=>\s*\w+\.name\s*\)\s*\)/s
 );
 ```