Fix deprecation warnings.

Shared/UserNotifications/UserNotificationManager.swift

@@ -62,8 +62,6 @@ private extension UserNotificationManager {
 		}
 		content.body = ArticleStringFormatter.truncatedSummary(article)
 		content.threadIdentifier = webFeed.webFeedID
-		content.summaryArgument = "\(webFeed.nameForDisplay)"
-		content.summaryArgumentCount = 1
 		content.sound = UNNotificationSound.default
 		content.userInfo = [UserInfoKey.articlePath: article.pathUserInfo]
 		content.categoryIdentifier = "NEW_ARTICLE_NOTIFICATION_CATEGORY"

iOS/AppDelegate.swift

@@ -50,7 +50,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterD
 		didSet {
 			if unreadCount != oldValue {
 				postUnreadCountDidChangeNotification()
-				UIApplication.shared.applicationIconBadgeNumber = unreadCount
+				UNUserNotificationCenter.current().setBadgeCount(unreadCount)
 			}
 		}
 	}