BGE: Fix from HG1 for bug [#32831] "TrackTo aktuator +X direction not working correct" reported by HG1.

Looks like a vector needed to be inverted for the +X calculation.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53754 954f8c5b-7b00-dc11-b283-0030488c597c