win32: request the UTF-8 code page for Windows APIs

This sets the activeCodePage property in the manifest, which forces the
ANSI code page to be UTF-8 in Windows 10 1903 and up. It shouldn't make
a difference for mpv itself, since mpv already uses the wide-char APIs
for most functions, however some of mpv's dependencies, such as Lua,
rely on the ANSI codepage. Hence this change enables support for Unicode
file names in Lua's I/O library.

Thanks @avih for finding this property.

See:
https://docs.microsoft.com/en-us/windows/uwp/design/globalizing/use-utf8-code-page

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