Implement edit-player. Optimizations.

templates/modals/add_player.html

@@ -41,10 +41,7 @@
                 const oppClanListIndex = document.getElementById('opponent-clan').selectedIndex;
 
                 const submitButton = addPlayerModal.querySelector('button[name="submit"]');
-                submitButton.addEventListener('click', function (e) {
-                    e.preventDefault();
-                    submitButton.onclick = function () {}
-
+                submitButton.addEventListener('click', function () {
                     fetch("/player", {
                         method: "POST",
                         body: JSON.stringify({