fix: helper.js was updating form.answer

theme/puzzle.html

@@ -21,7 +21,7 @@
         <ul id="files"></ul>
         <p>Puzzle by <span id="authors">[loading]</span></p>
       </section>
-      <form>
+      <form class="submit-answer">
         <label for="answer">Answer:</label>
         <input type="text" name="answer" id="answer"> <span class="answer_ok"></span>
         <br>

theme/puzzle.mjs

@@ -211,7 +211,7 @@ async function init() {
     window.setanswer = (str => SetAnswer(str))
     window.checkAnswer = (str => window.app.puzzle.IsPossiblyCorrect(str))
 
-    for (let form of document.querySelectorAll("form.answer")) {
+    for (let form of document.querySelectorAll("form.submit-answer")) {
         form.addEventListener("submit", formSubmitHandler)
         for (let e of form.querySelectorAll("[name=answer]")) {
             e.addEventListener("input", answerInputHandler)