Tests:
- Add a custom shortcut and provide a custom icon for it in
/var/www/plinth/custom/static/icons/. Visit the page /plinth/api/1/shortcuts/.
The icon path for the custom shortcut is correct and accessible from browser.
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>