patch 8.2.4345: <amatch> is expanded like a file name for DirChangedPre

Problem:    <amatch> is expanded like a file name for DirChangedPre.
Solution:   Do not expand <amatch>. (closes #9742)  Also for the User event.
diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index 3ff4c3c..d3c9b89 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
Binary files differ