Remove extraneous Semantics node (#159)

* Update backdrop.dart

* Update backdrop.dart

Former-commit-id: bd80e2b6f950eece06e8d1a083856596a3520290
diff --git a/lib/pages/backdrop.dart b/lib/pages/backdrop.dart
index e72dbd6..39cb716 100644
--- a/lib/pages/backdrop.dart
+++ b/lib/pages/backdrop.dart
@@ -160,8 +160,7 @@
           excluding: !isSettingsOpen,
           child: isSettingsOpen
               ? RawKeyboardListener(
-                  // TODO: Implement RawKeyboardListener.includeSemantics
-                  // includeSemantics: false,
+                  includeSemantics: false,
                   focusNode: _settingsPageFocusNode,
                   onKey: (event) {
                     if (event.logicalKey == LogicalKeyboardKey.escape) {