treeview: Initialize iImage and iSelectedImage with zero

[Felix Nawothnig]

This fixes bug #5311. Note that the regedit problem described in a
comment is still fixed by the (wineItem->iSelectedImage >= 0). Testcase
passed with native comctl32 v5.82.2900.2982.

ChangeLog:
- Initialize iImage and iSelectedImage with zero
- Add testcase
---
    dlls/comctl32/tests/treeview.c |    8 ++++++++
    dlls/comctl32/treeview.c       |    8 ++++++--
    2 files changed, 14 insertions(+), 2 deletions(-)


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