Fixed Bug 8263

Issue on packetver 20131223 or newer where skill-damage with type 6 would be considered by the client as endure-type, fixing by swapping with value 8 which presents no different graphical representation than it'd otherwise.
Special Thanks to kyeme, Rytech, Valo.
http://hercules.ws/board/tracker/issue-8263-dec-23-2013-client/

Signed-off-by: shennetsind <ind@henn.et>
Fixed Bug 8325

Code did not expect sd->equip_index to be empty ( -1 ), which'd cause a crash as reported.
Special Thanks to Gerz!
http://hercules.ws/board/tracker/issue-8325-another-map-server-crash-on-skill-shield-spell/

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