fix: mobile actions hide and mobile theme (#8447)

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/desktop/pages/remote_page.dart

@@ -328,10 +328,8 @@ class _RemotePageState extends State<RemotePage>
                                   .mobileActionsOverlayVisible.isFalse,
                               child: Overlay(initialEntries: [
                                 makeMobileActionsOverlayEntry(
-                                  () => _ffi
-                                      .dialogManager
-                                      .mobileActionsOverlayVisible
-                                      .value = false,
+                                  () => _ffi.dialogManager
+                                      .setMobileActionsOverlayVisible(false),
                                   ffi: _ffi,
                                 )
                               ]),

flutter/lib/mobile/pages/settings_page.dart

@@ -569,8 +569,8 @@ class _SettingsState extends State<SettingsPage> with WidgetsBindingObserver {
           SettingsTile(
             title: Text(translate(
                 Theme.of(context).brightness == Brightness.light
-                    ? 'Dark Theme'
-                    : 'Light Theme')),
+                    ? 'Light Theme'
+                    : 'Dark Theme')),
             leading: Icon(Theme.of(context).brightness == Brightness.light
                 ? Icons.dark_mode
                 : Icons.light_mode),