Amount spent calculated from amouth authorised for payment rather tha…

…n amount claimed

lowfat/models/claimant.py

@@ -456,4 +456,4 @@ def claimantship_spent(self):
             grant_heading="F"
         )
 
-        return sum([expense.amount_claimed for expense in this_claimant_expenses])
+        return sum([expense.amount_authorized_for_payment for expense in this_claimant_expenses])