Reset course cover continuation guard after use #9793

Job	Run time
Preparing	7s
DB Init build (arm, treehouses/node-tags:arm-3.18)	28s
DB Init build (arm64, treehouses/node-tags:arm64-3.18)	31s
DB Init build (amd64, treehouses/node:3.18)	26s
Manifest build	5s
	1m 37s

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