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src/io/file.h: fix build on gcc-12

Merged Sergei Trofimovich requested to merge trofi/inkscape:fix-on-gcc-12 into master

gcc-12 enables c++17 by default and disallows std::string to be initialized by NULL pointer:

src/io/file.h:29:63: error: use of deleted function
  'std::__cxx11::basic_string<...>::basic_string(std::nullptr_t) [...]'
   29 | SPDocument* ink_file_new(const std::string &Template = nullptr);
      |                                                               ^

As C++ does not define behaviour for std::string(NULL) let's use safe "" as empty value;