patch 9.1.0420: :browse oldfiles prompts even with single entry

Problem:  :browse oldfiles prompts even with single entry
Solution: Do not prompt, but edit the file directly,
          also when using :filter /pat/ browse oldfiles

closes: #14794

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 34f474d..aafbddc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    420,
+/**/
     419,
 /**/
     418,