patch 8.2.1513: cannot interrupt shell used for filename expansion

Problem:    Cannot interrupt shell used for filename expansion. (Dominique
            Pellé)
Solution:   Do set tmode in mch_delay(). (closes #6770)
diff --git a/src/channel.c b/src/channel.c
index 3e7ec96..0b41133 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -904,7 +904,7 @@
 	    *waittime -= elapsed_msec;
 	    if (waitnow > 0)
 	    {
-		mch_delay((long)waitnow, TRUE);
+		mch_delay((long)waitnow, MCH_DELAY_IGNOREINPUT);
 		ui_breakcheck();
 		*waittime -= waitnow;
 	    }