patch 8.0.0237: when 'wildoptions' is "tagfile" completion may not work

Problem:    When setting wildoptions=tagfile the completion context is not set
            correctly. (desjardins)
Solution:   Check for EXPAND_TAGS_LISTFILES. (Christian Brabandt, closes #1399)
diff --git a/src/version.c b/src/version.c
index 684a244..68ea529 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    237,
+/**/
     236,
 /**/
     235,