main/libmaxminddb: fix database retrieval
- Allow MaxMind license key input required for downloads
- Update db retrieval
For some time this package has been semi-broken and unable to download or update the MaxMind databases because MaxMind no longer offers direct downloads of the free databases without a license key due to GDPR. However they allow any user to generate license keys for free by registering on their website:
This PR allows the user to input their license key into the conf file, and enables the cron script to retrieve the databases.