patch 8.2.1281: the "trailing characters" error can be hard to understand

Problem:    The "trailing characters" error can be hard to understand.
Solution:   Add the trailing characters to the message.
diff --git a/src/quickfix.c b/src/quickfix.c
index 4957f7d..1901e38 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -3579,7 +3579,7 @@
     }
     if (!get_list_range(&arg, &idx1, &idx2) || *arg != NUL)
     {
-	emsg(_(e_trailing));
+	semsg(_(e_trailing_arg), arg);
 	return;
     }
     qfl = qf_get_curlist(qi);