Config Page fixes
- go back to ScrollablePage, the content height is calculated correctly, no anchors on height of the contents
- when the field already has focus and the popup is closed, open on click
- when the popup doesn't fit under the field, open it on top
- use a scrollview to not overlap item separators and scrollbar
- don't dynamically resize the popup, to not make the text field jump around on worse, switch dynamically between opening on top or bottom
- text field/back button always visible, to make easier to go back