patch 8.1.0670: macro for popup menu width is unused

Problem:    Macro for popup menu width is unused.
Solution:   Remove it. (Hirohito Higashi)
diff --git a/src/version.c b/src/version.c
index fe98bc4..2226241 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    670,
+/**/
     669,
 /**/
     668,