Fixed spelling

ref #193

src/models/actions/create/CreateFixedDonation.ts

@@ -21,7 +21,7 @@ export class CreateFixedDonation extends CreateDonation {
         let newDonation = new FixedDonation;
 
         newDonation.amount = this.amount;
-        newDonation.payedAmount = this.payedAmount;
+        newDonation.paidAmount = this.paidAmount;
         newDonation.donor = await this.getDonor();
 
         return newDonation;