stall-analyser: use 0 for default value of --minimum #224

Job	Run time
Test with C++20 modules enabled / test	12m 20s
Test with DPDK enabled / test	22m 26s
Test (clang++, C++20, dev) / test	4m 46s
Test (clang++, C++20, debug) / test	16m 3s
Test (clang++, C++23, debug) / test	15m 58s
Test (clang++, C++20, release) / test	15m 2s
Test (clang++, C++23, dev) / test	17m 7s
Test (clang++, C++23, release) / test	16m 12s
Test (g++, C++20, debug) / test	19m 12s
Test (g++, C++20, dev) / test	12m 13s
Test (g++, C++23, debug) / test	19m 3s
Test (g++, C++20, release) / test	16m 57s
Test (g++, C++23, dev) / test	4m 30s
Test (g++, C++23, release) / test	17m 31s
	3h 29m 20s

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