patch 8.1.0090: "..." used inconsistently in a message

Problem:    "..." used inconsistently in a message.
Solution:   Define the message with " ..." once. (hint by Ken Takata)
diff --git a/src/version.c b/src/version.c
index d49516e..1cc6012 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    90,
+/**/
     89,
 /**/
     88,