UI and error message fixes for 16k developer option

- Disallow disabling option when hardware offload
values aren't default ones. This was bypassing warning dialogue
- For ext4 format dialog, add a delete icon and change confirmation text
- Change error message when update is pending.
- Add padding to progress dialog

Test: m Settings && adb install -r $ANDROID_PRODUCT_OUT/system_ext/priv-app/Settings/Settings.apk
Bug: 295035851
Bug: 338139884
Change-Id: Ib1c3ac075a75a8515fe725103b062983ecf11fba

src/com/android/settings/development/EnableExt4WarningDialog.java

@@ -70,8 +70,9 @@ public class EnableExt4WarningDialog extends InstrumentedDialogFragment
     public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
         return new AlertDialog.Builder(getActivity())
                 .setTitle(R.string.confirm_format_ext4_title)
+                .setIcon(R.drawable.ic_delete_accent)
                 .setMessage(R.string.confirm_format_ext4_text)
-                .setPositiveButton(android.R.string.ok, this /* onClickListener */)
+                .setPositiveButton(R.string.main_clear_confirm_title, this /* onClickListener */)
                 .setNegativeButton(android.R.string.cancel, this /* onClickListener */)
                 .create();
     }