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

ElementX/Sources/Services/Room/RoomInfoProxy.swift

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