Some fixes for shaarli: - Pass on_install to required packages decorator. - Fix indentation.
Some fixes for shaarli:
- Pass on_install to required packages decorator.
- Fix indentation.

vignanl/Plinth,freedomboxtwh/Plinth,harry-7/Plinth,freedomboxtwh/Plinth,vignanl/Plinth,freedomboxtwh/Plinth,vignanl/Plinth,kkampardi/Plinth,harry-7/Plinth,freedomboxtwh/Plinth,kkampardi/Plinth,harry-7/Plinth,vignanl/Plinth,harry-7/Plinth,kkampardi/Plinth,harry-7/Plinth,kkampardi/Plinth,kkampardi/Plinth,freedomboxtwh/Plinth,vignanl/Plinth