fix: reset cloud-init fields when closing server creation modal

Add cloud-init script fields to the resetSelection() method that's
called when the modal is closed. This ensures a clean slate when
reopening the "Connect a Hetzner Server" view.

Fields reset:
- cloud_init_script
- save_cloud_init_script
- cloud_init_script_name
- selected_cloud_init_script_id

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/Livewire/Server/New/ByHetzner.php

@@ -103,6 +103,10 @@ class ByHetzner extends Component
     {
         $this->selected_token_id = null;
         $this->current_step = 1;
+        $this->cloud_init_script = null;
+        $this->save_cloud_init_script = false;
+        $this->cloud_init_script_name = null;
+        $this->selected_cloud_init_script_id = null;
     }
 
     public function loadTokens()