regedit: Convert from WCHAR size to maximum required TCHAR size.

[Byeong-Sik Jeon]

In MBCS, this is really bug of regedit.

If we create the registry value in the empty registry key,
we can't see anything newly created registry value.

Changelog:
    Convert from WCHAR size to maximum required TCHAR size.
---
 programs/regedit/listview.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
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