Fix speed modifiers for spells Permafrost, Improved Curse of Exhaustion, Camouflage, Pathfinding, Amplify Curse, Cheetah Sprint
This is a hack way, but the other way I can not see because the error is in the DBC. This can be seen when you compare DBC with next patch.

Signed-off-by: cala <calaftp@free.fr>
Merge pull request #32 from cala/speedmodifiers