remove NewGroupAddMembersCoordinator (now completely unused)

deltachat-ios/Controller/GroupMembersViewController.swift

@@ -2,8 +2,6 @@ import UIKit
 import DcCore
 
 class NewGroupAddMembersViewController: GroupMembersViewController {
-    weak var coordinator: NewGroupAddMembersCoordinator?
-
     var onMembersSelected: ((Set<Int>) -> Void)?
     let isVerifiedGroup: Bool
 

deltachat-ios/Controller/NewGroupController.swift

@@ -379,8 +379,6 @@ class NewGroupController: UITableViewController, MediaPickerDelegate {
         if let navigationController = self.parent as? UINavigationController {
             let newGroupController = NewGroupAddMembersViewController(preselected: preselectedMembers,
                                                                       isVerified: isVerified)
-            let coordinator = NewGroupAddMembersCoordinator(dcContext: dcContext, navigationController: navigationController)
-            newGroupController.coordinator = coordinator
             newGroupController.onMembersSelected = onGroupMembersSelected(_:)
             navigationController.pushViewController(newGroupController, animated: true)
         }

deltachat-ios/Coordinator/AppCoordinator.swift

@@ -619,19 +619,6 @@ class ChatViewCoordinator: NSObject, Coordinator {
     }
 }
 
-// MARK: - NewGroupAddMembersCoordinator
-class NewGroupAddMembersCoordinator: Coordinator {
-    var dcContext: DcContext
-    let navigationController: UINavigationController
-
-    private var childCoordinators: [Coordinator] = []
-
-    init(dcContext: DcContext, navigationController: UINavigationController) {
-        self.dcContext = dcContext
-        self.navigationController = navigationController
-    }
-}
-
 /*
  boilerplate - I tend to remove that interface (cyberta)
  */