Revert "Bump Umbra version"

This reverts commit 5b142bf.

Author: szarnyasg

umbra/scripts/vars.sh

@@ -5,7 +5,7 @@ export UMBRA_DDL_DIR=`pwd`/ddl/
 export UMBRA_DATABASE_DIR=`pwd`/scratch/db/
 export UMBRA_BACKUP_DIR=`pwd`/scratch/backup/
 export UMBRA_CONTAINER_NAME=snb-interactive-umbra
-export UMBRA_VERSION=75f99d093
+export UMBRA_VERSION=e7415d13f
 export UMBRA_DOCKER_IMAGE=umbra-release:${UMBRA_VERSION}
 
 export UMBRA_USER=postgres