Revert "Update OverviewCommandHelper to use Executors.MAIN to reduce the percentage of missed frames"

This CL didn't improve the performance metrics significantly enough to use Executors.MAIN. b/366077002#comment12

This reverts commit 7eae20bcb11ab487ae2b16083ba8b4ba37463c85.
Reason for revert: 366077002

Change-Id: Ic92b83a65aef7f8cd5c00110fb1ab7343d4b12b6
2 files changed