Use error_path route helper instead of hardcoded string

Author: costajohnt

app/views/error/index.html.erb

@@ -2,6 +2,6 @@
   <div class="card-body">
     <h1 class="card-title">Intentional Error Test</h1>
     <p class="card-text" style="color:grey">Click the button below to trigger an intentional test exception.</p>
-    <%= button_to "Trigger Exception", "/error", method: :post, class: "btn btn-danger", data: { turbo: false } %>
+    <%= button_to "Trigger Exception", error_path, method: :post, class: "btn btn-danger", data: { turbo: false } %>
   </div>
 </div>