enhance(explorer): explorer dropdowns are never searchable on mobile
enhance(explorer): explorer dropdowns are never searchable on mobile

otherwise, the keyboard pops up and takes up much of the screen real estate
owid/owid-grapher,OurWorldInData/owid-grapher,owid/owid-grapher,OurWorldInData/owid-grapher,OurWorldInData/owid-grapher,owid/owid-grapher,owid/owid-grapher,owid/owid-grapher,OurWorldInData/owid-grapher,OurWorldInData/owid-grapher