fix(Android): Avoid crash when writing on closed socket.

Fixes Rapsssito#167

Author: Rapsssito

android/src/main/java/com/asterinet/react/tcpsocket/TcpSocketModule.java

@@ -124,7 +124,6 @@ public void end(final Integer cId) {
             public void run() {
                 TcpSocketClient socketClient = getTcpClient(cId);
                 socketClient.destroy();
-                socketMap.remove(cId);
             }
         });
     }