Change default setting back to MODE_MF and TONE_LENGTH_FAST.

bluebox.c

@@ -281,7 +281,7 @@ do { \
  * zeroth byte.  Then came across a warning from Atmel not to do that.
  * I can't remember where I found that warning.
  */
-uint8_t ee_data[] EEMEM = {0xff, MODE_DTMF, TONE_LENGTH_SLOW};
+uint8_t ee_data[] EEMEM = {0xff, MODE_MF, TONE_LENGTH_FAST};
 
 uint8_t tone_mode;
 uint8_t tone_length;