Fixed guild aura not going away on guild-break/expell

Also modified sd->state.gmaster_flag from struct to a 'unsigned int : 1;' flag as sd->guild already stores the pointer and was thus a duplicate.
Special Thanks to Haru, Xgear

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