Remove innodb_* options from server config that are default in 10.3

The options innodb_file_format and innodb_large_prefix no longer
exist in 10.3, so they need to be removed.

The option innodb_default_row_format is now default, so there is no
need to define it in the server config anymore.

See https://mariadb.com/kb/en/library/innodb-system-variables/