typescript: fix build
typescript: fix build

Summary:
The new 'languageserver' subdirectory was being unintentionally
globbed into the build command.  Fix this by switching the glob
to whitelist *.ts in the current directory rather than attempting
to blacklist all subdirectories.

Reviewers: #core_team, zarko

Reviewed By: #core_team, zarko

Subscribers: #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1825

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