PATCH - Avoid removing listbox item with (-1) index.

[Oleg Prokhorov <xolegpro@rbcmail.ru>]

Hello wine-patch,

Problem:
I've found that wine allows to remove items form combobox/listbox with
invalid (-1) index /item is not selected/. Windows doesn't allow this.

Change-log:
Avoid removing listbox item with (-1) index.

-- 
Best regards,
 Oleg                          mailto:xolegpro@rbcmail.ru

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