Fix claims being flagged for qa

When a new academic year has started, and we are yet to approved any
claims from this academic year, all claims from the previous year are
flagged for qa when approved. To avoid this we need to count the number
of approved claims in the _claim's_ academic year rather than the
current academic year.

app/models/claim.rb

@@ -282,10 +282,11 @@ def flaggable_for_qa?
   def below_min_qa_threshold?
     return false if policy::MIN_QA_THRESHOLD.zero?
 
-    claims_approved_so_far = Claim.by_policy(policy).current_academic_year.approved.count
+    approved_claims = Claim.by_policy(policy).by_academic_year(academic_year).approved
+    claims_approved_so_far = approved_claims.count
     return true if claims_approved_so_far.zero?
 
-    (Claim.by_policy(policy).current_academic_year.approved.qa_required.count.to_f / claims_approved_so_far) * 100 <= policy::MIN_QA_THRESHOLD
+    (approved_claims.qa_required.count.to_f / claims_approved_so_far) * 100 <= policy::MIN_QA_THRESHOLD
   end
 
   def qa_completed?