TBusyLabel: hard-code size to 16x16
TBusyLabel: hard-code size to 16x16

The previous solution didn't appear to be working in the designer, and
at the moment I can't imagine wanting this to be a size other than 16x16.

Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui