disconnect previous websocket before creating new one

LeStorage/StoreCenter.swift

@@ -83,6 +83,9 @@ public class StoreCenter {
     }
     
     fileprivate func _configureWebSocket() {
+        self._webSocketManager?.disconnect()
+        self._webSocketManager = nil
+        
         guard let userId = self.userId else {
             Logger.w("Tried to configure websocket but userId is nil")
             return