main/tcpdump: update executable path
As of tcpdump 4.99.0, the tcpdump executable is installed to bin rather than sbin. See: https://github.com/the-tcpdump-group/tcpdump/commit/95096be4f0c7c3efd459e3ff3bcfb526164ed446
As of tcpdump 4.99.0, the tcpdump executable is installed to bin rather than sbin. See: https://github.com/the-tcpdump-group/tcpdump/commit/95096be4f0c7c3efd459e3ff3bcfb526164ed446