Fix incorrect behaviour of context menu (singerdmx#1734)

Author: EgorK0rshun

lib/src/widgets/raw_editor/raw_editor_state.dart

@@ -528,8 +528,11 @@ class QuillRawEditorState extends EditorState
       // ClipboardStatusNotifier with a default value of unknown will cause the
       // clipboard status to be checked w/o user interaction which fails. Default
       // to pasteable for web.
-      _clipboardStatus = ClipboardStatusNotifier(
-          value: kIsWeb ? ClipboardStatus.pasteable : ClipboardStatus.unknown);
+      if (kIsWeb) {
+        _clipboardStatus = ClipboardStatusNotifier(
+          value: ClipboardStatus.pasteable,
+        );
+      }
     }
 
     if (widget.configurations.scrollable) {