Update AddonGrammar.cpp

[anonyein]

ggml-org/llama.cpp@5cab3e4#diff-a215f95f866e314c7273b474b79129852b1e30c3b2ff87b4f341e317208d22b0R38

Description of change

Pull-Request Checklist

• Code is up-to-date with the master branch
• npm run format to apply eslint formatting
• npm run test passes with this change
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change
• The new commits and pull request title follow conventions explained in pull request guidelines (PRs that do not follow this convention will not be merged)

[giladgd]

Thanks for the PR!
This is already fixed in #405, along with many other breaking changes.