Fix calendar styling in course clone modal
Fix calendar styling in course clone modal

This was missed style regression after the upgrade of ReactDayPicker.

alpha721/WikiEduDashboard,alpha721/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,sejalkhatri/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,sejalkhatri/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,alpha721/WikiEduDashboard,sejalkhatri/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,sejalkhatri/WikiEduDashboard,alpha721/WikiEduDashboard,sejalkhatri/WikiEduDashboard