Correct event signature of BoldPlaceableSubscriber

[bero]

Due to changes in Bold the signature of BoldPlaceableReceiver.OnReceive has changed
Requestedevent: Integer
has become
Requestedevent: TBoldRequestedEvent

This results in different declaration of event implementation in forms, and causes Delphi to complain about incompatible event.

To fix the problem:
Replace all occurrences of Requestedevent: Integer with Requestedevent: TBoldRequestedEvent