Payment type of the fee at time of disbursement is not saved in the database

Currently, when you choose 'Mode of payment' for the fee at time of disbursement, then payment type for this fee is not saved in the database.

Repro:
1. Create a loan that has a fee due at time of disbursement
2. Approve the loan
3. Navigate to loan account page and click "Disburse Loan" link on left
4. You should have 2 sections-- one to process the loan disbursement and one
for fee payment
5. Saelect any payment type in "mode of payment" drop-down for fee payment.
6. Disburse Loan.
7. Check in the database that proper payment type is saved.

Actual result:
In account_payment table, there is no transaction related to paid fee during disbursement. There is only one transaction which has amount equal to "disbursement amount - fee" and payment type is the same as it was selected for disbursement but not for fee.

Expected result:
In account_payment table, there is a transaction related to paid fee during disbursement and with correct payment type (the same as it was selected during disbursement).