Update print jobs appropriately in the print settings.

- Always use a fresh print job as once the print job goes away it cannot
  be read. Before we were stuck with the last state which might not been
  the last state
- make loaders relative to fragment to avoid loader id duplications with
  other ids of the activity.

Fixes: 28315242
Change-Id: I57eeb64b44b5d77b2092c22b175407131f7baf97

src/com/android/settings/print/PrintServiceSettingsFragment.java

@@ -606,7 +606,7 @@ public class PrintServiceSettingsFragment extends SettingsPreferenceFragment
         @Override
         public Loader<List<PrinterInfo>> onCreateLoader(int id, Bundle args) {
             if (id == LOADER_ID_PRINTERS_LOADER) {
-                return new PrintersLoader(getActivity());
+                return new PrintersLoader(getContext());
             }
             return null;
         }