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/connection_page.dart

@@ -66,6 +66,7 @@ class _ConnectionPageState extends State<ConnectionPage> {
   Widget build(BuildContext context) {
     Provider.of<FfiModel>(context);
     return SingleChildScrollView(
+      controller: ScrollController(),
       child: Column(
           mainAxisAlignment: MainAxisAlignment.start,
           mainAxisSize: MainAxisSize.max,

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) {

flutter/lib/mobile/pages/remote_page.dart

@@ -759,6 +759,7 @@ class _RemotePageState extends State<RemotePage> {
             expand: false,
             builder: (context, scrollController) {
               return SingleChildScrollView(
+                  controller: ScrollController(),
                   padding: EdgeInsets.symmetric(vertical: 10),
                   child: GestureHelp(
                       touchMode: gFFI.ffiModel.touchMode,