Revert "Change FTDX10 handshake to None instead of Hardware"

This reverts commit aeb2692b42.

Testing another DX10 shows hardware handshake is needed.
Perhaps when using only a 3-wire serial port it still works with no handshake

rigs/yaesu/ftdx10.c

@@ -147,7 +147,7 @@ struct rig_caps ftdx10_caps =
     .serial_data_bits =   8,
     .serial_stop_bits =   2,
     .serial_parity =      RIG_PARITY_NONE,
-    .serial_handshake =   RIG_HANDSHAKE_NONE,
+    .serial_handshake =   RIG_HANDSHAKE_HARDWARE,
     .write_delay =        FTDX10_WRITE_DELAY,
     .post_write_delay =   FTDX10_POST_WRITE_DELAY,
     .timeout =            2000,