Update config file with grace periods in all cases
Update config file with grace periods in all cases

Before this commit the config was not updated with grace period data
unless something else was being updated in the file already.

E.g. HOTP always updates the file, as does using an emergency code.

Fixes #193

google/google-authenticator-libpam,google/google-authenticator-libpam,google/google-authenticator-libpam,google/google-authenticator-libpam