patch 8.2.4864: Vim9: script test fails

Problem:    Vim9: script test fails.
Solution:   Remove "if" around declaration.
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 33dd787..dd33a92 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -4132,10 +4132,8 @@
   var Var_func: func
   var var_string: string
   var var_blob: blob
-  if has('job')
-    var var_job: job
-    var var_channel: channel
-  endif
+  var var_job: job
+  var var_channel: channel
   var var_list: list<any>
   var var_dict: dict<any>