Fixed Bug 8037

Player's var db was being cleared on unit free rather than on auth db clear, which'd cause map server to crash when trying to save already-disconnected (aka char logged out when char server was down) data.
Special Thanks to FeNixZ.
http://hercules.ws/board/tracker/issue-8037-map-crash-every-6-12/

Signed-off-by: shennetsind <ind@henn.et>
Merge branch 'master' of https://github.com/HerculesWS/Hercules