[MERGED PR] Decreases spy bounty refresh interval to 15 minutes on classic.

[Ikea]

The reason why I decided to keep the interval the same for roleplay is because spies can already get pretty stacked on roleplay, but more importantly Im unsure if the faster pace would benefit roleplay. This change very much intentionally forces spies to work faster if they want to get all the stuff they want. Id highly appreciate more feedback from roleplay peeps who are more involved in crew/antag affairs to if the current spy pace should remain the same, be sped up a bit (down to 20 minutes) or sped up a lot (down to 25).