patch 9.0.1189: invalid memory access with folding and using "L"

Problem:    Invalid memory access with folding and using "L".
Solution:   Prevent the cursor from moving to line zero.
diff --git a/src/testdir/test_fold.vim b/src/testdir/test_fold.vim
index adf9e52..f915a66 100644
--- a/src/testdir/test_fold.vim
+++ b/src/testdir/test_fold.vim
Binary files differ