Avoid using Ulauncher modules outside of `ulauncher.api`

[friday]

See Ulauncher/Ulauncher#920

SortedList that you are using has been removed completely from Ulauncher v6 (not yet released, more info here), but you don't really need it. Python has native functionality for sorting lists, or you can copy it from the v5 branch of Ulauncher if you want to keep using it.