Automatic Screen Lock delay from gnome settings ignored/overriden by mobile settings

[pravi]

phosh developers think this is flx1 specific issue.

Originally reported upstream https://gitlab.gnome.org/World/Phosh/phosh-mobile-settings/-/work_items/124#note_2789908

Though I wonder if both are setting the same value, we should not be able to set different values in both places.