android: Drop indirection listening to pref change

Let `LibreOfficeMainActivity` implement the standard
Android `SharedPreferences.OnSharedPreferenceChangeListener`
interface directly, rather than having a custom
`SettingsListenerModel.OnSettingsPreferenceChangedListener`
indirection and the `SettingsFragment` implementing the
standard interface.

This simplifies the code and removes one level of
indirection.

Drop the now unused `SettingsListenerModel`.

Change-Id: I8c7d6088e711631409f9189bba966439db3daa44
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/167723
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions