budget check error doesn't work in application screen

[marcj303]

If the user updates the budget amount on the application screen the error isn't shown if it is out of range.

In the ApplicationController, updateApplication() checks the amount and should return the error, but the ajax doesn't seem to catch it.

The original value is not updated. This confused an applicant as they thought they couldn't update the budget amount. Their update was out of range, but they didn't get a message.