patch 8.2.2366: when using ":sleep" the cursor is always displayed

Problem:    When using ":sleep" the cursor is always displayed.
Solution:   Do not display the cursor when using ":sleep!". (Jeremy Lerner,
            closes #7688)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 7fe33d8..9562e6b 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -7225,14 +7225,17 @@
 	case NUL: len *= 1000L; break;
 	default: semsg(_(e_invarg2), eap->arg); return;
     }
-    do_sleep(len);
+
+    // Hide the cursor if invoked with !
+    do_sleep(len, eap->forceit);
 }
 
 /*
  * Sleep for "msec" milliseconds, but keep checking for a CTRL-C every second.
+ * Hide the cursor if "hide_cursor" is TRUE.
  */
     void
-do_sleep(long msec)
+do_sleep(long msec, int hide_cursor)
 {
     long	done = 0;
     long	wait_now;
@@ -7244,7 +7247,11 @@
     ELAPSED_INIT(start_tv);
 # endif
 
-    cursor_on();
+    if (hide_cursor)
+        cursor_off();
+    else
+        cursor_on();
+
     out_flush_cursor(FALSE, FALSE);
     while (!got_int && done < msec)
     {