applets: react to power-profile-daemon dbus registration
Made tlpInstalled a bindable property as it can change now.
BUG: 492859 (cherry picked from commit 46a49ded)
cc @jpetso
Made tlpInstalled a bindable property as it can change now.
BUG: 492859 (cherry picked from commit 46a49ded)
cc @jpetso