patch 8.1.0563: setting v:errors to a string give confusing error

Problem:    Setting v:errors to a string give confusing error. (Christian
            Brabandt)
Solution:   Change internal error into normal error message.
diff --git a/src/version.c b/src/version.c
index f86f7c9..474c96b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    563,
+/**/
     562,
 /**/
     561,