Acq purchase requests: Clear Completed Requests button is active even if request is not in appropriate state

[Tiffany Little]

In the Patron Requests interface, when any request is selected the "Clear Completed Requests" button is active, even if those requests are not in the correct state to be cleared.

Fortunately, if you do click the button when you have requests selected that are not in the correct state, those requests are not cleared away. This is good.

However, it would be best if the button would remain inactive/greyed out unless all holds selected are in a clearable state.