Use CTRL_A macro instead of '1' for Ctrl-A character constant.

src/sbbs3/qwktomsg.cpp

@@ -358,7 +358,7 @@ bool sbbs_t::qwk_import_msg(FILE *qwk_fp, char *hdrblk, ulong blocks
 		if(!fromhub && (qwkbuf[k]==CTRL_A || qwkbuf[k]==ESC)
 			&& useron.rest&FLAG('A'))
 			continue;
-		if(qwkbuf[k]!=1 && lastch!=1)
+		if(qwkbuf[k]!=CTRL_A && lastch!=CTRL_A)
 			col++;
 		if(lastch==CTRL_A && !valid_ctrl_a_code(qwkbuf[k])) {
 			if(taillen) taillen--;