runtime/gnuradio-config-info: print unquoted path for userconfdir

For some reason, std::cout::operator<< decides to put
std::filesystem::path into ""; this breaks applications that try to use
the output of gnuradio-config-info --userprefsdir directly.

Using .string() seems to solve that. Strange, but not worth
investigating much.

Signed-off-by: Marcus Müller <[email protected]>

gnuradio-runtime/apps/gnuradio-config-info.cc

@@ -68,7 +68,7 @@ int main(int argc, char** argv)
         std::cout << gr::prefsdir() << std::endl;
 
     if (vm.count("userprefsdir") || print_all)
-        std::cout << gr::paths::userconf() << std::endl;
+        std::cout << gr::paths::userconf().string() << std::endl;
 
     // Not included in print all due to verbosity
     if (vm.count("prefs"))