threading: use correct mutex name in reverse_lock fatal error messages #539

Job	Run time
macOS 14 native, arm64, fuzz	15m 52s
macOS 14 native, arm64, no depends, sqlite only, gui	17m 19s
Linux->Windows cross, no tests	58m 10s
Windows native, fuzz, VS 2022	37m 37s
ASan + LSan + UBSan + integer, no depends, USDT	1h 6m 0s
Windows native, VS 2022	1h 36m 7s
test each commit	0s
Windows, test cross-built	44m 9s
	5h 35m 14s

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