decal objects are listed in the context menu but only with a placeholder name "Decal"

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@928 14438d79-0ffd-4333-8ae7-ea2bdd901387
delete conversion leftover

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@929 14438d79-0ffd-4333-8ae7-ea2bdd901387