This change should have no user impact.
`DonateInfoSheetHeaderView` was used in two places: the "choose payment
method" sheet and the "confirm PayPal donation" sheet. However, the
latter was removed in 3404ababe5, meaning
this view was only used in one place.
For clarity, this moves it back into the "choose payment method" sheet
and removes the special view. It is a partial revert of
dc3e588f64.
8f873dcdaa
