storage: Re-enable DisruptiveElection test on propEvalKV
storage: Re-enable DisruptiveElection test on propEvalKV

The test now appears stable when run under stress.

Closes #10577

vaibhavarora/cockroach,paperstreet/cockroach,maxlang/cockroach,vaibhavarora/cockroach,petermattis/cockroach,paperstreet/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,glycerine/cockroach,paperstreet/cockroach,paperstreet/cockroach,maxlang/cockroach,paperstreet/cockroach,petermattis/cockroach,vaibhavarora/cockroach,maxlang/cockroach,petermattis/cockroach,maxlang/cockroach,maxlang/cockroach,vaibhavarora/cockroach,glycerine/cockroach,glycerine/cockroach,vaibhavarora/cockroach,glycerine/cockroach,vaibhavarora/cockroach,glycerine/cockroach,petermattis/cockroach,paperstreet/cockroach,glycerine/cockroach,maxlang/cockroach,glycerine/cockroach,petermattis/cockroach,maxlang/cockroach,glycerine/cockroach,petermattis/cockroach,paperstreet/cockroach,petermattis/cockroach,petermattis/cockroach,maxlang/cockroach,vaibhavarora/cockroach