t/force-delete: bash is not always at /bin/bash

Signed-off-by: Brandon Smith <freedom@reardencode.com>
[rlb@defaultvalue.org: adjust commit message]
Reviewed-by: Rob Browning <rlb@defaultvalue.org>
US/Central is not a common timezone, use America/Chicago

Signed-off-by: Brandon Smith <freedom@reardencode.com>
Reviewed-by: Rob Browning <rlb@defaultvalue.org>