cubicweb #969169 [inline forms] do not show the 'remove' link if cardinality is '1x' [resolved]

either we show 'remove' + 'add' (so as to emulate a 'reset' feature, relying on validation to catch unduly removed forms)

or we do not show 'remove' at all

priorityimportant
typebug
done in3.8.5
load0.200
load left0.000
closed by<not specified>