Can we have an option to keep old queries when we do "restartdns"?

[yubiuser]

@El_Topo

Sometimes I need to run
pihole restartdns
to fix some pihole issues, currently this command clears "Total queries over last 24 hours" and causes empty history in Dashboard page (i.e., no data for "Totoal Queries" "Queries Blocked", "Percent Blocked", and "Total queries over last 24 hours" graph).

Implemented by
https://github.com/pi-hole/FTL/pull/1285

and released with Pi-hole FTL v5.14, Web v5.11 and Core v5.9 released