add ScrollController to each ScrollView

fix "The provided ScrollController is currently attached to more than one ScrollPosition"

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

flutter/lib/mobile/pages/file_manager_page.dart

@@ -203,6 +203,7 @@ class _FileManagerPageState extends State<FileManagerPage> {
       headTools(),
       Expanded(
           child: ListView.builder(
+        controller: ScrollController(),
         itemCount: entries.length + 1,
         itemBuilder: (context, index) {
           if (index >= entries.length) {