cubicweb #2496294 EditBox lost its selector [validation pending]

hence it will appear in contexts where it should'nt

this is a regression and also a clear violation of the contract stated in the docstring (where it is clearly made mention of an entity being edited)

prioritynormal
typebug
done in3.15.5
load left0.000
closed by#1ac70b1bf00e [views/boxes] re-establish the proper selector (closes #2496294)
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