refs #4007 this should have been in 84fb1bf34ae5f2fb8b1bc28f6219aeb5788518aa

 * don't override columns parameter when it is set from the dashboard widget "Visits Overview (with graph)"
 * remove columns parameter when requesting VisitsSummary.get

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what i did commit in 84fb1bf34ae5f2fb8b1bc28f6219aeb5788518aa was the first step towards making piwik work again in ie8. sorry for the mix up.