tool_cb_wrt: fix outfile mode flags for Windows

- Use S_IREAD and S_IWRITE mode permission flags to create the file
  on Windows instead of S_IRUSR, S_IWUSR, etc.

Windows only accepts a combination of S_IREAD and S_IWRITE. It does not
acknowledge other combinations, for which it may generate an assertion.

This is a follow-up to 81b4e99 from yesterday, which improved the
existing file check with -J.

Ref: https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/open-wopen#remarks
Ref: https://github.com/curl/curl/pull/5731

Closes https://github.com/curl/curl/pull/5742

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