Don't show 'Hand' cursor when player has no POWER_HAND

[mefistotelis]

Originally reported on Google Code with ID 409

In r1440 it is no possible to disable picking up creatures and gold by disabling POWER_HAND:
(MAGIC_AVAILABLE(PLAYER),POWER_HAND,0,0)

However, when hovering over a creature you cannot pickup, the moving-hand cursus still
appears, indicating pickup is available.

It would be better to show the arrow cursor instead, when you cannot use pickup.

Reported by Loobinex on 2014-10-30 12:17:40