patch 8.2.4519: Vim9: Can still use ":fini" and ":finis" for ":finish"

Problem:    Vim9: Can still use ":fini" and ":finis" for ":finish".
Solution:   Require using ":finish".
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index fb4b79e..46a2539 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -3400,6 +3400,8 @@
        'expor',
        'fina',
        'finall',
+       'fini',
+       'finis',
        'imp',
        'impo',
        'impor',