Fix [#37319] Forcefield on translated, unselected lamp draws in origin.

drawlamp() was not resetting OGL matrix to its org value!

Thanks to Philipp Oeser for initial investigation, and Brecht for review. :)

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@61140 954f8c5b-7b00-dc11-b283-0030488c597c