use pclose(popen()) for cw ID to prevent callsign cutoff

afsk/main.c

@@ -509,9 +509,9 @@ if (cw_id == ON)	// Don't send CW if using AX5043 or in mode cycling or set by 3
   digitalWrite (txLed, txLedOn);
 //printf("Before 1st strcpy\n");
 //printf("CW String: %s\n", cw_str);
-  popen(cw_str,"r");
+  pclose(popen(cw_str,"r"));  // execute command and wait for termination before continuing
 //printf("Before 1st strcpy\n");
-  sleep(6);
+//  sleep(7);
 //printf("Before Write\n");
   digitalWrite (txLed, txLedOn);
 //printf("After Write\n");