patch 8.1.2166: rubyeval() not tested as a method

Problem:    Rubyeval() not tested as a method.
Solution:   Change a test case.

Author: brammool

src/testdir/test_ruby.vim

@@ -46,7 +46,7 @@ func Test_set_cursor()
   " Check that movement after setting cursor position keeps current column.
   normal j
   call assert_equal([2, 6], [line('.'), col('.')])
-  call assert_equal([2, 5], rubyeval('$curwin.cursor'))
+  call assert_equal([2, 5], '$curwin.cursor'->rubyeval())
 
   call assert_fails('ruby $curwin.cursor = [1]',
         \           'ArgumentError: array length must be 2')

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2166,
 /**/
     2165,
 /**/