patch 8.2.2498: no test for what 8.2.2494 fixes

Problem:    No test for what 8.2.2494 fixes.
Solution:   Add a simple change to test the fix. (closes #7818)
diff --git a/src/testdir/test_viminfo.vim b/src/testdir/test_viminfo.vim
index 20d9074..cb090ce 100644
--- a/src/testdir/test_viminfo.vim
+++ b/src/testdir/test_viminfo.vim
@@ -638,6 +638,7 @@
 	\ ]
   call writefile(lines, 'Xviminfo')
   delmark E
+  edit /tmp/file_two.txt
   rviminfo! Xviminfo
   call delete('Xviminfo')