fix warning
support for FD types in sinsp_filter_check::string_to_rawval
Revert "format «%u» expects argument of type «unsigned int», but argument 3 has type «size_t»"

This reverts commit 9b231b2d0c15cb4bd9293719bd37e7c89bf91215.
Merge branch 'master' of https://github.com/draios/sysdig