fix burndown
fix burndown

We counted the done-tasks from Archived stories.
This results in a negative burndown because we
have more done-tasks than 'all tasks on the board'.

mafigit/Komorebi,mafigit/Komorebi,mafigit/Komorebi,kmerz/Komorebi,kmerz/Komorebi,kmerz/Komorebi,kmerz/Komorebi,mafigit/Komorebi