fix: backquote key will cause crash when using French IME (#892)

test/editor/editor_component/ime/delta_input_on_non_text_update_impl_test.dart

@@ -14,6 +14,7 @@ void main() {
           composing: TextRange(start: 0, end: 3),
         ),
         EditorState.blank(),
+        [],
       );
     });
   });