Add V13 height conditional for sidestake registry in GetLowestRegistr… #1780

Job	Run time
macOS 11 native [GOAL install] [GUI] [no depends]	6m 59s
Lint	47s
ARM [GOAL install] [buster]	3m 0s
Win32	2m 36s
Win64	6m 12s
i386 Linux [GOAL install] [focal]	2m 37s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	30m 41s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	19m 50s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [focal]	16m 14s
	1h 28m 56s

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