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