Revert "set a real pty for sending ssh commands"

This reverts commit a86176d.

Author: facchinm

arduino-core/src/cc/arduino/packages/ssh/SSH.java

@@ -58,9 +58,6 @@ public boolean execSyncCommand(String command, PrintStream stdoutConsumer, Print
     try {
       channel = session.openChannel("exec");
       ((ChannelExec) channel).setCommand(command);
-      ((ChannelExec) channel).setAgentForwarding(true);
-      ((ChannelExec) channel).setPty(true);
-      ((ChannelExec) channel).setPtyType( "xterm" );
 
       channel.setInputStream(null);