Unnecessarily duplicated `option` type

[cannorin]

ts2ocaml/src/ts2ocaml_es.mli

Line 2526 in c53134e

 val get_localeMatcher: 'tags this -> ([`L_s24_best_fit[@js "best fit"] | `L_s57_lookup[@js "lookup"]] [@js.enum]) option option [@@js.get "localeMatcher"] 

Caused by #314