fixed redirect error and added button to events.

Views/Ticket/buyTicketForm.phtml

@@ -6,12 +6,7 @@ include dirname(__DIR__).'/header.phtml';
     <div class="form-container">
         <h1>Ticket kaufen</h1>
         
-        <?php if (isset($error)): ?>
-            <div class="error-box"><?= htmlspecialchars($error) ?></div>
-            <div style="text-align:center; margin-top: 1.5em;">
-                <a href="?controller=Event&do=showEvents">Zurück zu den Events</a>
-            </div>
-        <?php elseif (isset($event)): ?>
+        <?php if (isset($event)): ?>
             <div class="event-details">
                 <h2><?= htmlspecialchars($event['name']) ?></h2>
                 <p><strong>Beschreibung:</strong> <?= nl2br(htmlspecialchars($event['description'])) ?></p>