If you want a simple answer, this change of two less players means that your average player will cost you 9.5% more ($12.38 instead of $11.30). You should bump all prices up 9.5%.
However, be careful in following this too closely. My guess would be that the $1-3 players won't be bumped at all, and the more expensive players will jump by more than 9.5%.
Also, consider whether you want to concentrate the price jump in hitters. Many drafters want to allocate a certain portion of their dollars to hitting and the remainder to pitching. (I usually spend around $160 on hitting and $100 on pitching.) With less hitters in your starting lineup, this makes the ones that you do have that much more important. Maybe you would want to bump the hitter's prices up 12-13%, while only moving pitchers up 4-5% or so.