enable rust default option

Signed-off-by: fufesou <shuanglongchen@yeah.net>

flutter/lib/desktop/pages/remote_tab_page.dart

@@ -246,13 +246,12 @@ class _ConnectionTabPageState extends State<ConnectionTabPage> {
             dismissOnClicked: true,
           ),
         ],
-        curOptionGetter: () async {
-          return await bind.sessionGetOption(id: key, arg: 'view-style') ??
-              'adaptive';
-        },
+        curOptionGetter: () async =>
+            // null means peer id is not found, which there's no need to care about
+            await bind.sessionGetViewStyle(id: key) ?? '',
         optionSetter: (String oldValue, String newValue) async {
-          await bind.sessionPeerOption(
-              id: key, name: "view-style", value: newValue);
+          await bind.sessionSetViewStyle(
+              id: key, value: newValue);
           ffi.canvasModel.updateViewStyle();
           cancelFunc();
         },