Remove delivered notifications for rooms that have meantime become fully read and have messages newer than what's delivered

- this is a best effort solution to cleanup outdated notifications when using multiple clients and reading them elsewhere

UnitTests/Sources/RoomSummaryTests.swift

@@ -62,6 +62,7 @@ class RoomSummaryTests: XCTestCase {
                     avatarURL: hasRoomAvatar ? roomDetails.avatarURL : nil,
                     heroes: heroes,
                     lastMessage: nil,
+                    lastMessageDate: nil,
                     lastMessageFormattedTimestamp: nil,
                     unreadMessagesCount: 0,
                     unreadMentionsCount: 0,