Fix inverted logic in `REveVector.hxx` (was already fixed in `graf3d/eve/inc/TEveVector.h`)
Fix inverted logic in `REveVector.hxx` (was already fixed in `graf3d/eve/inc/TEveVector.h`)

root-mirror/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,karies/root,root-mirror/root,karies/root,olifre/root,olifre/root,olifre/root,root-mirror/root,karies/root,olifre/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,karies/root,olifre/root,olifre/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,karies/root,root-mirror/root,olifre/root,karies/root