Remove useless extern in cmdqueue.cpp

Firmware/cmdqueue.cpp

@@ -2,8 +2,6 @@
 #include "cardreader.h"
 #include "ultralcd.h"
 
-extern bool Stopped;
-
 // Reserve BUFSIZE lines of length MAX_CMD_SIZE plus CMDBUFFER_RESERVE_FRONT.
 char cmdbuffer[BUFSIZE * (MAX_CMD_SIZE + 1) + CMDBUFFER_RESERVE_FRONT];
 // Head of the circular buffer, where to read.