winecfg: Enable add button when choosing lib from combobox (Libraries tabsheet)

[Andre Wisplinghoff]

This fixes a bug when choosing a lib from the combobox without modifying 
the edit box manually. In this case, the add button doesn't get enabled.

Technically the reason for this was that an editable Combobox only 
returns text which was manually entered on WM_GETTEXT. If the user 
selected an item from the combobox, the returned buffer is empty.

ChangeLog:
winecfg: Enable add button when choosing lib from combobox


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