Follow up https://github.com/HerculesWS/Hercules/commit/7ec1e8fdff6adad1979d750774f9003f223bf3ef

Fixed a issue with recently-invited guild members not being given the guild structure cache, special thanks to lighta for bringing the issue up (developed the fix with as well)

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