Fix TeamLocation <> PatientLocation association

Rails doesn't provide a way to reference the source object directly (through `it`) in a through association scope.

Author: murugapl

app/models/team_location.rb

@@ -44,7 +44,9 @@ class ActiveRecord_Relation < ActiveRecord::Relation
   has_many :sessions
 
   has_many :patient_locations,
-           -> { where(academic_year: it.academic_year) },
+           ->(team_location) do
+             where(academic_year: team_location.academic_year)
+           end,
            through: :location
 
   validate :subteam_belongs_to_team