Removed redundant compositor creation call from deferred shading demo.
Removed redundant compositor creation call from deferred shading demo.

--HG--
branch : v1-7

jhu-lcsr-forks/ogre,vancepym/ogre,ehsan/ogre,jhu-lcsr-forks/ogre,ruleless/ogre,ruleless/ogre,ruleless/ogre,nezticle/ogre,ehsan/ogre,ehsan/ogre,ruleless/ogre,ehsan/ogre,bhlzlx/ogre,jhu-lcsr-forks/ogre,largerussiangames/ogre,nezticle/ogre,ruleless/ogre,jhu-lcsr-forks/ogre,ruleless/ogre,bhlzlx/ogre,largerussiangames/ogre,vancepym/ogre,vancepym/ogre,ehsan/ogre,nezticle/ogre,bhlzlx/ogre,jhu-lcsr-forks/ogre,vancepym/ogre,bhlzlx/ogre,bhlzlx/ogre,largerussiangames/ogre,vancepym/ogre,largerussiangames/ogre,bhlzlx/ogre,nezticle/ogre