blob_completed before moving to next one

otherwise blob files download to the blobfiles directory, but they are
never recorded in blobs.db

lbrynet/reflector/server/server.py

@@ -89,6 +89,7 @@ class ReflectorServer(Protocol):
         else:
             self.incoming_blob = blob
             self.blob_finished_d, self.blob_write, self.cancel_write = blob.open_for_writing(self.peer)
+            self.blob_finished_d.addCallback(lambda _ :self.blob_manager.blob_completed(blob))
             return {'send_blob': True}
 
     def close_blob(self):