Change of the billed reservation icon in planing.

In Unified, once a reservation is invoiced, the building symbol appears in the planing. Until now, this symbol was exclusively used to differentiate between corporate bookings. For later control, this change makes it difficult for us to identify the reservations that are company reservations from those of individuals or agencies.

Although it is good that an icon appears to indicate that the reservation has been invoiced, we propose to change it to an invoice icon, different from the building icon or the agency icon.