Improve `ndpi_set_config` error printing. #3771

Job	Run time
Python Bindings (ubuntu-latest)	1m 24s
ubuntu-latest x86_64 --with-local-libgcrypt cc	5m 34s
Test Utils (ubuntu-latest)	4m 5s
ubuntu-latest x86_64 cc	5m 54s
ubuntu-20.04 x86_64 --with-local-libgcrypt cc	5m 13s
ubuntu-20.04 x86_64 cc	4m 55s
macOS-latest x86_64 --with-local-libgcrypt cc	4m 19s
macOS-latest x86_64 cc	6m 46s
macos-13 x86_64 --with-local-libgcrypt cc	4m 58s
macos-13 x86_64 cc	4m 14s
windows-latest x86_64 --with-local-libgcrypt cc	16m 32s
windows-latest x86_64 cc	8m 1s
ubuntu-20.04 x86_64 gcc-4.9 --with-pcre2 --with-maxminddb --with-sanitizer	7m 13s
ubuntu-22.04 x86_64 gcc-13 --with-pcre2 --with-maxminddb --with-sanitizer --with-lto-and-gold-linker	9m 33s
ubuntu-20.04 x86_64 clang-7 --with-pcre2 --with-maxminddb --with-sanitizer	10m 30s
ubuntu-22.04 x86_64 clang-17 --with-pcre2 --with-maxminddb --with-sanitizer --with-lto-and-gold-linker	10m 50s
ubuntu-latest x86_64 cc --with-pcre2 --with-maxminddb --with-thread-sanitizer	18m 3s
ubuntu-latest x86_64 cc --with-pcre2 --with-maxminddb --with-sanitizer nBPF	6m 21s
ubuntu-latest x86_64 cc --with-pcre2 --with-maxminddb --with-sanitizer --disable-global-context-support	8m 50s
ubuntu-22.04 x86_64 clang-17 --with-pcre2 --with-maxminddb --with-memory-sanitizer	39m 4s
macOS-latest x86_64 cc --with-pcre2 --with-maxminddb	5m 32s
macos-14 x86_64 cc	2m 3s
ubuntu-latest arm64 cc --with-pcre2 --with-maxminddb	18m 30s
ubuntu-latest armhf cc --with-pcre2 --with-maxminddb --with-sanitizer	37m 24s
ubuntu-latest s390x cc --with-pcre2 --with-maxminddb	16m 59s
	4h 22m 47s

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