patch 8.2.0966: 'shortmess' flag "n" not used in two places

Problem:    'shortmess' flag "n" not used in two places.
Solution:   Make use of the "n" flag consistent. (Nick Jensen, closes #6245,
            closes #6244)
diff --git a/src/fileio.c b/src/fileio.c
index 06a4c51..3896ba8 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -506,7 +506,8 @@
 			}
 		    }
 		    if (dir_of_file_exists(fname))
-			filemess(curbuf, sfname, (char_u *)_("[New File]"), 0);
+			filemess(curbuf, sfname,
+					      (char_u *)new_file_message(), 0);
 		    else
 			filemess(curbuf, sfname,
 					   (char_u *)_("[New DIRECTORY]"), 0);