Make Print Settings use the new PrintManager.getPrintServices loader

This makes sure that all data always stays up to date.

printer_dropdown_item.xml:
- Reduce the amount of overriden properties

PrintServiceSettingsFragment:
- Instead receiving most data from PrintSettingsFragment have own loader
  and keep data up to date
- Also the updating of the print service state now has a dedicated
  PrintManager call instead of relying of the Settings-ContentObserver
  to transport this information. No more race-conditions, whohoo!

DynamicIndexableContentMonitor:
- To not rewrite too much code the update logic has to live here but the
  reading of the actual data is in PrintSettingsFragment.

Change-Id: I60715cda8952565d7f68cb24fb7da61a37085887