Fixed first person offset to use world transform

It slipped my mind that some necks might not be perfectly vertical.

apps/openmw/mwrender/camera.cpp

@@ -190,7 +190,7 @@ namespace MWRender
     void Camera::setSneakOffset()
     {
         if(mAnimation)
-            mAnimation->addFirstPersonOffset(Ogre::Vector3(-9.8f, 0.f, 0.f));
+            mAnimation->addFirstPersonOffset(Ogre::Vector3(0.f, 0.f, -9.8f));
     }
 
     float Camera::getYaw()

apps/openmw/mwrender/npcanimation.cpp

@@ -457,7 +457,7 @@ Ogre::Vector3 NpcAnimation::runAnimation(float timepassed)
 
         // This has to be done before this function ends;
         // updateSkeletonInstance, below, touches the hands.
-        node->translate(mFirstPersonOffset);
+        node->translate(mFirstPersonOffset, Ogre::Node::TS_WORLD);
     }
     mFirstPersonOffset = 0.f; // reset the X, Y, Z offset for the next frame.