remove the else block from this code

this code can probably be refactored such that it doesn't have an else block.  start with `$scope.selected_rep.overview.leader = !!$scope.selected_rep.overview.leadership_role` (or just omitting the `leader` property and using `leadership_role`

https://github.com/EpiphanyMachine/influence/blob/master/src/coffee/angular/controllers-c-individual.coffee#L35-L41
