Fix recruitment in Bartlett1932
Fix recruitment in Bartlett1932

Remove the special casing for number of participants as that's now
handled by a special recruiter. This allows the experiment to be agnostic
of the recuriter used.

jcpeterson/Dallinger,Dallinger/Dallinger,Dallinger/Dallinger,Dallinger/Dallinger,jcpeterson/Dallinger,Dallinger/Dallinger,jcpeterson/Dallinger,jcpeterson/Dallinger,jcpeterson/Dallinger,Dallinger/Dallinger