remove static cellHeight constant from AvatarSelectionCell

deltachat-ios/View/AvatarSelectionCell.swift

@@ -3,7 +3,6 @@ import DcCore
 
 class AvatarSelectionCell: UITableViewCell {
     let badgeSize: CGFloat = 72
-    static let cellHeight: CGFloat = 98
 
     var onAvatarTapped: (() -> Void)?