Remove extra space from command name

Created by: bbockelm

When $CMD was switched to a bash list instead of a string, bash no longer stripped off the extra ' ' character. Thus, Singularity was attempting to execute a binary named ' foo' instead of 'foo'.

I was able to recreate this by logging in to a worker node with a running glidein, making a copy of the job wrapper script, and applying the patch by hand. I was able to:

• Reproduce the errors reported by Diego in https://ggus.eu/index.php?mode=ticket_info&ticket_id=128469,
• Verify that this fix took care of the reported error.
• Verify that arguments with spaces in them appear to work.

Mystery solved, hopefully!

@rynge - it's not clear to me why the OSG pilots don't hit the same issue. Thoughts?