allow user to go back from fee slider.
MODIFY
WalletWasabi.Fluent/Views/Wallets/Send/FeeSliderView.axaml
WalletWasabi.Fluent/Views/Wallets/Send/FeeSliderView.axaml
<c:ContentArea Title="{Binding Title}"
CancelContent="Cancel"
EnableCancel="{Binding EnableCancel}"
- EnableBack="{Binding EnableBack}"
+ EnableBack="true"
EnableNext="True" NextContent="Continue"
IsBusy="{Binding IsBusy}">
<DockPanel>

allow user to go back from fee slider.