remove flashbang rushing

[Leeanei]

Everyone security player was new at security once. It doesn't really matter how many rounds they've played, either, because most people won't have a reason to touch dangerous grenades until they try security. The syndie grenade packs aren't purchased all that often. We shouldn't make an underplayed role even worse for people to pick up. A lot of the 'shitsec' people also aren't actually all that new. They know what they are doing, and punishing new security over flashbang fuckups isn't gunna affect shitsec.