income-piechart fix

[Dave Peticolas]

Christian Stimming writes:
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> Fixes the account selection option in the income-expense-piechart.  If the 
> user selects non-income/expense accounts, then those are simply ignored. 
> 
> However, this results in a different set of accounts to be shown and to be 
> selected (The selection can't be changed, IIRC). Since this might be 
> confusing for the user, we should consider to not only validate the user's 
> choice, but also change it to reflect the actual accepted choice. What do 
> people (esp. dave_p) think?

You're right, the options should be updated to reflect
the validated value. This should happen now.

dave