package-lock.json: remove obsolete fluent-syntax (#1818)
package-lock.json: remove obsolete fluent-syntax (#1818)

This should've been removed as part of c52a603.
mathjazz/pontoon,mozilla/pontoon,mozilla/pontoon,mathjazz/pontoon,mozilla/pontoon,mozilla/pontoon,mathjazz/pontoon,mathjazz/pontoon,mozilla/pontoon,mathjazz/pontoon