g10: Use total days, not total messages to compute TOFU validity
* g10/tofu.c (write_stats_status): Use the number of days with signatures / encryptions to compute the validity, not the total number of signatures / encryptions. (BASIC_TRUST_THRESHOLD): Adjust given the new semantics. (FULL_TRUST_THRESHOLD): Likewise.
- Signed-off-by: Neal H. Walfield <neal@g10code.com>