add missing Get.delete, android can update id controller

Signed-off-by: 21pages <pages21@163.com>

flutter/lib/mobile/pages/connection_page.dart

@@ -196,6 +196,9 @@ class _ConnectionPageState extends State<ConnectionPage> {
   @override
   void dispose() {
     _idController.dispose();
+    if (Get.isRegistered<IDTextEditingController>()) {
+      Get.delete<IDTextEditingController>();
+    }
     super.dispose();
   }
 }