patch 8.1.2166: rubyeval() not tested as a method

Problem:    Rubyeval() not tested as a method.
Solution:   Change a test case.
diff --git a/src/version.c b/src/version.c
index e7ba706..c7d0ace 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2166,
+/**/
     2165,
 /**/
     2164,