vim-patch:8.2.4361: Vim9: some tests fail

Problem:    Vim9: some tests fail.
Solution:   Fix the tests, mostly by removing "s:".

62b191c387

Co-authored-by: Bram Moolenaar <Bram@vim.org>

test/old/testdir/test_expr.vim

@@ -613,7 +613,8 @@ func Test_function_with_funcref()
       call assert_equal(4, Ref('text'))
   END
   call CheckTransLegacySuccess(lines)
-  " cannot create s: variable in :def function
+  " skip CheckTransDefSuccess(), cannot assign to script variable
+  call map(lines, {k, v -> v =~ 'legacy' ? v : substitute(v, 's:', '', 'g')})
   call CheckTransVim9Success(lines)
 endfunc