Revert "use isDm from the SDK to determine if a room is a direct one to one room."

This reverts commit 58d0841bedb9cc40bd5880a76f3cc1f56c3b8bdb.

ElementX/Sources/Services/Room/RoomInfoProxy.swift

@@ -54,10 +54,6 @@ struct RoomInfoProxy: RoomInfoProxyProtocol {
         roomInfo.isSpace
     }
     
-    var isDM: Bool {
-        roomInfo.isDm
-    }
-    
     var successor: SuccessorRoom? {
         roomInfo.successorRoom
     }

ElementX/Sources/Services/Room/RoomInfoProxyProtocol.swift

@@ -38,7 +38,6 @@ protocol RoomInfoProxyProtocol: BaseRoomInfoProxyProtocol {
     var isDirect: Bool { get }
     var isSpace: Bool { get }
     var isFavourite: Bool { get }
-    var isDM: Bool { get }
     
     var canonicalAlias: String? { get }
     var alternativeAliases: [String] { get }

ElementX/Sources/Services/Room/RoomProxyProtocol.swift

@@ -224,7 +224,7 @@ extension JoinedRoomProxyProtocol {
     }
     
     var isDirectOneToOneRoom: Bool {
-        infoPublisher.value.isDM
+        infoPublisher.value.isDirect && infoPublisher.value.activeMembersCount <= 2
     }
 
     func members() async -> [RoomMemberProxyProtocol]? {