Sets EpochAccountsHash to Valid in accounts bench

[brooksprumo]

Problem

While removing the featurization code for EpochAccountsHash, a bench failed because EAH was now enabled.

Summary of Changes

Set EAH to Valid so that Bank::new_from_parent() doesn't panic during freeze.

[jeffwashington]

did you find this while running accounts bench somehow? when the feature was activated?

[jeffwashington]

lgtm

[brooksprumo]

did you find this while running accounts bench somehow? when the feature was activated?

CI found it. In removing the EAH feature gate (#34417), it effectively makes EAH always ON where it used to be OFF. Since this bench runs through enough banks to make it into the EAH window, it now has to follow the EAH rules.

[codecov]

Codecov Report

Merging #34420 (9bd3097) into master (39a3566) will increase coverage by 0.0%.
Report is 7 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #34420   +/-   ##
=======================================
  Coverage    81.9%    81.9%           
=======================================
  Files         819      819           
  Lines      220984   220984           
=======================================
+ Hits       181015   181034   +19     
+ Misses      39969    39950   -19