winreg: fix values encoding
winreg: fix values encoding

Values were encoded as string due to a bug when base64 encoding binary
registry values.

Now REG_DWORD and REG_QWORD values are returned as integers and
REG_BINARY are returned as base64 encoded utf8 strings.

Signed-off-by: Matteo Cafasso <43c758619f0ced9dc5c51a50803f3466c86e4c3d@gmail.com>

noxdafox/vminspect