fix(datepicker): refix issue with moment import (#2023)
fix(datepicker): refix issue with moment import (#2023)

- this was issue , broken by 27a022922370947d54c3cfd357399eb588e8d01f
fixes #1556
valor-software/ngx-bootstrap,Le0Michine/ng2-bootstrap,valor-software/ng2-bootstrap,valor-software/ngx-bootstrap,Le0Michine/ng2-bootstrap,valor-software/ngx-bootstrap,valor-software/ngx-bootstrap,valor-software/ng2-bootstrap