Update spec to work around weird behavior of classes on datepicker input.
Update spec to work around weird behavior of classes on datepicker input.

For some reason, the class for the date input field is sometimes changed to 'invalid' instead of 'datepicker__input'.

thenickcox/WikiEduDashboard,alpha721/WikiEduDashboard,alpha721/WikiEduDashboard,alpha721/WikiEduDashboard,majakomel/WikiEduDashboard,WinnySilva/WikiEduDashboard,MusikAnimal/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,sejalkhatri/WikiEduDashboard,Wowu/WikiEduDashboard,sejalkhatri/WikiEduDashboard,KarmaHater/WikiEduDashboard,ragesoss/WikiEduDashboard,feelfreelinux/WikiEduDashboard,MusikAnimal/WikiEduDashboard,ragesoss/WikiEduDashboard,adamwight/WikiEduDashboard,feelfreelinux/WikiEduDashboard,sejalkhatri/WikiEduDashboard,adamwight/WikiEduDashboard,Wowu/WikiEduDashboard,feelfreelinux/WikiEduDashboard,adamwight/WikiEduDashboard,Wowu/WikiEduDashboard,ragesoss/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,majakomel/WikiEduDashboard,majakomel/WikiEduDashboard,KarmaHater/WikiEduDashboard,WinnySilva/WikiEduDashboard,thenickcox/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,MusikAnimal/WikiEduDashboard,feelfreelinux/WikiEduDashboard,WinnySilva/WikiEduDashboard,sejalkhatri/WikiEduDashboard,KarmaHater/WikiEduDashboard,alpha721/WikiEduDashboard,Wowu/WikiEduDashboard,KarmaHater/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,thenickcox/WikiEduDashboard,majakomel/WikiEduDashboard,sejalkhatri/WikiEduDashboard,MusikAnimal/WikiEduDashboard