Bug 24395: Show initial float using the Price TT plugin on summary page

Bug 24395: Show initial float using the Price TT plugin on summary page

For displaying monetary amounts, we should be using the Price TT
plugin everywhere. This adds it to the cash register summary page.

To test:
- Create a cash register
- Check the cash register table for "Initial float"
- Verify the amount shows with more than 2 decimals
- Edit cash register - verify the same display there
- Apply patch
- Check again - it should display now with only 2 decimals

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>