kv: reenable the local call optimization by default
kv: reenable the local call optimization by default

The local call optimization was accidentally disabled by #5430.

vaibhavarora/cockroach,veteranlu/cockroach,paperstreet/cockroach,cockroachdb/cockroach,paperstreet/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,maxlang/cockroach,sunya123/cockroach,glycerine/cockroach,cockroachdb/cockroach,maxlang/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,cockroachdb/cockroach,paperstreet/cockroach,sunya123/cockroach,petermattis/cockroach,vivekmenezes/cockroach,vivekmenezes/cockroach,petermattis/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,maxlang/cockroach,maxlang/cockroach,petermattis/cockroach,arjun4084346/cockroach,glycerine/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,petermattis/cockroach,arjun4084346/cockroach,veteranlu/cockroach,glycerine/cockroach,glycerine/cockroach,maxlang/cockroach,veteranlu/cockroach,arjun4084346/cockroach,arjun4084346/cockroach,maxlang/cockroach,cockroachdb/cockroach,sunya123/cockroach,vivekmenezes/cockroach,veteranlu/cockroach,vaibhavarora/cockroach,maxlang/cockroach,vaibhavarora/cockroach,sunya123/cockroach,glycerine/cockroach,sunya123/cockroach,petermattis/cockroach,vaibhavarora/cockroach,sunya123/cockroach,veteranlu/cockroach,vaibhavarora/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,maxlang/cockroach,glycerine/cockroach,sunya123/cockroach,arjun4084346/cockroach,veteranlu/cockroach,sunya123/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,paperstreet/cockroach,paperstreet/cockroach,petermattis/cockroach,glycerine/cockroach,cockroachdb/cockroach,petermattis/cockroach,glycerine/cockroach,vaibhavarora/cockroach,vivekmenezes/cockroach,vivekmenezes/cockroach,petermattis/cockroach,cockroachdb/cockroach