Fix print init; print_set_sendchar in main

converter/usb_usb/main.cpp

@@ -13,6 +13,7 @@
 #include "lufa.h"
 
 #include "timer.h"
+#include "sendchar.h"
 #include "debug.h"
 #include "keyboard.h"
 
@@ -39,6 +40,7 @@ static void LUFA_setup(void)
 
     // for Console_Task
     USB_Device_EnableSOFEvents();
+    print_set_sendchar(sendchar);
 }
 
 static void HID_setup()