patch 8.2.2569: 'fillchars' "stl" and "stlnc" items must be single byte

Problem:    'fillchars' "stl" and "stlnc" items must be single byte.
Solution:   Accept multi-byte characters. (Christian Wellenbrock, Yegappan
            Lakshmanan, closes #7927)
diff --git a/src/version.c b/src/version.c
index da9328c..ffedb4f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2569,
+/**/
     2568,
 /**/
     2567,