Bugfix: Corpse stays locked when looting fails

If looting fails either because of cooldown or there are items on your
cursor, the client is sent an end loot packet- the client releases the
corpse but no one else can loot. This simply resets BeingLootedBy in
this instance.
Merge remote-tracking branch 'origin/master' into Development
Merge pull request #274 from RicardoCampos/Development

Bugfix: Corpse stays locked when looting fails