[iOS] Fix shader library path for sample browser.
[iOS] Fix shader library path for sample browser.

paroj/ogre,paroj/ogre,OGRECave/ogre,RealityFactory/ogre,OGRECave/ogre,RealityFactory/ogre,RealityFactory/ogre,OGRECave/ogre,paroj/ogre,OGRECave/ogre,RealityFactory/ogre,paroj/ogre,paroj/ogre,OGRECave/ogre,RealityFactory/ogre