Fix admin panel JS: use data-attribute for balance button (was emitting invalid onclick)

app/main.py

@@ -232,7 +232,7 @@ function render(members) {
       '<td>' + esc(reset) + '</td>' +
       '<td><div class="adjust">' +
       '<input id="add-' + i(m.email) + '" placeholder="+$" />' +
-      '<button onclick="addBalance(\'' + esc(m.email) + '\')">Add</button>' +
+      '<button data-email="' + esc(m.email) + '" onclick="addBalance(this.dataset.email)">Add</button>' +
       '</div></td>' +
       '</tr>';
   }).join('');