-T datefix does not fix summarize results

[djw1149]

See how summarize output still has epoch times:

$ dnsdbq -r foo -l 1 -T datefix -j -V summarize
{"count":176,"num_results":1,"zone_time_first":1565039132,"zone_time_last":1589899994}

$ dnsdbq -r foo -l 1 -T datefix -j
{"count":176,"zone_time_first":"2019-08-05 21:05:32","zone_time_last":"2020-05-19 14:53:14","rrname":"foo.","rrtype":"NS","bailiwick":"foo.","rdata":["ns-tld1.charlestonroadregistry.com.","ns-tld2.charlestonroadregistry.com.","ns-tld3.charlestonroadregistry.com.","ns-tld4.charlestonroadregistry.com.","ns-tld5.charlestonroadregistry.com."]}