ikiwiki: Fix showing icon for newly created wiki/blog
ikiwiki: Fix showing icon for newly created wiki/blog

The add shortcut API was changed but the call where we add shortcuts
after creating wiki/blog was not updated.

Closes #719.

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