[logout-greeter] Fix sleep.
According to /usr/include/KF5/KDELibs4Support/solid/powermanagement.h the correct number for Solid::PowerManagement::SuspendState is 2, not 1.
According to /usr/include/KF5/KDELibs4Support/solid/powermanagement.h the correct number for Solid::PowerManagement::SuspendState is 2, not 1.