patch 9.0.0473: fullcommand() only works for the current script version

Problem:    fullcommand() only works for the current script version.
Solution:   Add an optional argument for the script version.
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 7febc12..27ca8bf 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -662,6 +662,9 @@
         \ '3match':     'match',
         \ 'aboveleft':  'aboveleft',
         \ 'abo':        'aboveleft',
+        \ 'en':         'endif',
+        \ 'end':        'endif',
+        \ 'endi':        'endif',
         \ 's':          'substitute',
         \ '5s':         'substitute',
         \ ':5s':        'substitute',