Fix Expertise and make Proficiency calc readable

Not sure why Proficiency was calculated with "ceil((@{level})/1e10)" instead of "1" because they are functionally the same thing (PC will never reach a level over 1e10).

Added brackets to the Expertise calculation because it was only multiplying the 1, making Expertise's bonus a +1 instead of +Proficiency.

Realised after editing that adding the brackets to the Proficiency calculations might have been the way to go as it would fix similar problems in other situations at the same time.