lib: fix some misuse of curlx_convert_wchar_to_UTF8 #8521
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curlx_convert_wchar_to_UTF8 must be freed by curlx_unicodefree, but
prior to this change some uses mistakenly called free.
I've reviewed all other uses of curlx_convert_wchar_to_UTF8 and
curlx_convert_UTF8_to_wchar.
Ref: 1d5d0ae
Closes #xxxx
Sort of related: I find it confusing that in non-Unicode builds curlx_convert_UTF8_to_tchar and curlx_convert_tchar_to_UTF8 just duplicate the string in its current encoding, and a while ago I added a comment here but it's still easy to forget. Since the purpose of those functions in non-unicode builds is just to use the current encoding then wouldn't it be better to call them curlx_convert_multibyte_to_tchar and curlx_convert_tchar_to_multibyte?