Fix bug in UpdateGreylistCandidateEntry (tbs) #2166

Job	Run time
Lint	46s
ARM [GOAL install] [bullseye]	9m 3s
Win32	10m 35s
Win64	10m 51s
macOS 13 native [GOAL install] [GUI] [no depends]	11m 52s
i386 Linux [GOAL install] [focal]	10m 50s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	10m 50s
x86_64 Linux [GOAL install] [GUI] [noble] [no depends]	10m 51s
x86_64 Linux [ASan] [LSan] [UBSan] [integer] [jammy] [no depends]	10m 51s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	10m 51s
arm64 macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	10m 50s
	1h 48m 10s

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