[C++][Arrow Flight SQL ODBC] Fix value for `lpstrFilter`

### Describe the enhancement requested

From https://learn.microsoft.com/en-us/windows/win32/api/commdlg/ns-commdlg-openfilenamea:
> To retrieve a shortcut's target without filtering, use the string "All Files\0*.*\0\0".

AC:

https://github.com/apache/arrow/blob/bab558061696ddc1841148d6210424b12923d48e/cpp/src/arrow/flight/sql/odbc/odbc_impl/ui/dsn_configuration_window.cc#L569-L570
In above code, replace `All\0*.*` with `"All Files\0*.*\0\0"`. Since ODBC is using unicode, using the wide character string is the correct choice here. \

Parent issue: https://github.com/apache/arrow/issues/30622

### Component(s)

C++, FlightRPC