Bug: New account does not take start date set by user

[scubamaggo]

Where did this bug occur?

• Local development
• Self hosted app (i.e. Docker)

Describe the bug
When creating a new account, the user can set the start_date via the account creation form. However, setting this field does not have any affect during the account creation. The initial valuation of the account is still set to "today", not the configured start date.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Accounts'
2. Click on 'New Account'
3. Click on 'Bank Account' and then 'Enter account balance manually'
4. Fill in all the fields and choose a start date in the past
5. Click 'Add bank account' to finish creating the account.
6. Go back to the main dashboard and navigate to the newly created account.
7. The history will show today's date as for the manually entered value, not the start date.

Expected behavior
The start date should be taken as the date on which the initial balance of the account is set.

[scubamaggo]

#781 fixes it