Removed error exit from module setup

Module setup was using `set -e`, but since the script is sourced, that
can have unintended consequences later in the script.

ush/module-setup.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-set -eu
+set -u
 
 if [[ $MACHINE_ID = jet* ]] ; then
     # We are on NOAA Jet