Revert "don't disable lockscreen widgets on low memory devices (1/2)"

This reverts commit bfa7fa4425b1a7335a9cc539ba315525830bd203.
Revert "Allow homescreen widgets on the lockscreen (1/2)"

This reverts commit 6c929291ed9630ac1e04fd741803b5f74911fa45.
Revert "Revert "don't disable lockscreen widgets on low memory devices (1/2)""

This reverts commit 64a94905315fc966dee3796f931811d975a8d60f.