regedit: Fix item text reading in regedit

[Bruno Jesus]

The macro ListView_GetItemTextW takes the count of WCHAR as parameter,
not the count of WCHAR * sizeof(WCHAR). This leads to memory
corruption and random segfaults. The attached patch pass the correct
value and also simplify the item == 0 case and avoid double multiply
operation.

This problem currently is rare because it only happens with strings >
63 bytes since the current start allocation value is 128.

Fixes bug http://bugs.winehq.org/show_bug.cgi?id=22060
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