forums: 'subscribe' checkbox is initially unchecked #4700

Job	Run time
libs-build	5m 44s
apps-build	10m 1s
libs-cmake-build	7m 37s
client-armv6-build	3m 13s
client-arm-build	3m 16s
client-arm64-build	3m 35s
client-x86-build	3m 2s
client-x86_64-build	3m 21s
manager-build (assembleRelease)	3m 44s
manager-build (assembleXiaomi_release)	3m 51s
manager-build (assembleArmv6_release)	3m 53s
manager-build (jacocoTestReportDebug)	6m 11s
	57m 28s

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