cubicweb #5227394 bad "remove" link on inlined form with cardinality '+' [validation pending]

the remove link is displayed even on the first entity, which shouldn't be removed according to the cardinality

prioritynormal
typebug
done in3.20.9
load1.000
load left0.000
closed by#0019b7888dd7 [forms] don't display 'remove' link of inlined form for the first entity related using a '+' cardinality to its parent entity
patch[forms] don't display 'remove' link of inlined form for the first entity related using a '+' cardinality to its parent entity [applied]