Play CTF capture sound when destroy obelisk in Overload

Makes Overload consistent with CTF, 1 Flag CTF, and Harvester.
Team score in gametype > GT_TEAM use capture sound.
Fix item pickup sounds playing twice

Game VM always thought clients had cg_predictItems disabled.
In quake3, cg_predictItems had CVAR_USERINFO added in cl_main.c.
I missed adding it to cgame when removing cg_predictItems from cl_main.c.