Add contentPadding param for PrefsScreen to pass to LazyColumn.

[kolyneh]

Hi Jama.
I think contentPadding should be passed to LazyColumn for that we can use TopAppBar's ScrollBehavior with it.

[JamalMulla]

Hi. If you want to write a patch, I'll be happy to accept it. I can't devote any time to this rn I'm afraid.