PROG: Deleted a line in BundleObservation.cpp for an unused variable which...

PROG:  Deleted a line in BundleObservation.cpp for an unused variable which was throwing a warning during compilation.  References #4314

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/branches/ipce@7174 41f8697f-d340-4b68-9986-7bafba869bb8