fixed: when adding a cert remove previous cert before copying the new one
fixed: when adding a cert remove previous cert before copying the new one

This fixes when a user (or plugin) has replaced the cert with a symlink; else the symlinked file would be overwritten.

This mainly is in the case of a global-cert (plugin) wildcard cert

dokku/dokku,progrium/dokku,dokku/dokku,progrium/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku,claytonbrown/dokku,dokku/dokku,claytonbrown/dokku,dokku/dokku,progrium/dokku,claytonbrown/dokku,dokku/dokku,progrium/dokku,claytonbrown/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,progrium/dokku,progrium/dokku,claytonbrown/dokku,claytonbrown/dokku,dokku/dokku