Remove trigger thinning from 2018 data for EXOT8 [ATLASDPD-1436]
This implements a workaround for the data-thinning issues for b-jet triggers discuss din https://its.cern.ch/jira/browse/ATLASDPD-1436
Pinging @egramsta and @boeriu, as well as @kkrizka @jveatch for EXOT8.