patch 8.1.0059: displayed digraph for "ga" wrong with 'encoding' "cp1251"

Problem:    Displayed digraph for "ga" wrong with 'encoding' "cp1251".
Solution:   Convert from 'encoding' to "utf-8" if needed. (closes #3015)
diff --git a/src/version.c b/src/version.c
index f7c5f2e..68b4c26 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    59,
+/**/
     58,
 /**/
     57,