[cwconfig] Remove useless 'ui-cube' configuration option (closes #3728904)
The mechanism introduced could never actually be used as it brings dependency
loops to the cube graph. Just get rid of it.
This reverts commit 4032499c701e.
addressbook
basket
blog
book
calendar
comment
company
email
file
folder
i18ncontent
keyword
link
mailinglist
person
tag
timeseries
vcsfile