#45 TXPictureValidator incorrect logic for Unicode

[Ognyan Chernokozhev]

The logic
i += CharSize((LPCTSTR)Pic.c_str() + i);
in
TPXPictureValidator::ToGroupEnd()
is incorrect, as it causes it to skip every other character, and leads to buffer overrun.

This is demonstrated by the Validate example, which uses a TXPictureValidator with _T("###-##-####") and crashes when trying to process the input

[Ognyan Chernokozhev]

Fixed in 6.21.10