Fix scorll error.

lib/view/page/convert.dart

@@ -50,6 +50,7 @@ class _ConvertPageState extends State<ConvertPage>
       body: GestureDetector(
         child: SingleChildScrollView(
             padding: const EdgeInsets.symmetric(horizontal: 7),
+            controller: ScrollController(),
             child: Column(children: [
               const SizedBox(height: 13),
               _buildInputTop(),

lib/view/page/ping.dart

@@ -48,6 +48,7 @@ class _PingPageState extends State<PingPage>
                 width: double.infinity,
                 height: _media.size.height * 0.6,
                 child: ListView.builder(
+                    controller: ScrollController(),
                     itemCount: _results.length,
                     itemBuilder: (context, index) {
                       final result = _results[index];

lib/view/page/server/tab.dart

@@ -71,6 +71,7 @@ class _ServerPageState extends State<ServerPage>
       }
       return ListView.separated(
         padding: const EdgeInsets.all(7),
+        controller: ScrollController(),
         itemBuilder: (ctx, idx) {
           if (idx == pro.servers.length) {
             return SizedBox(height: _media.padding.bottom);