cubicweb #2165936 [widget] in/out widget hard codes its default size [validation pending]

(also the code is badly formatted)

prioritynormal
typebug
done in3.14.3
load0.100
load left0.000
closed by#0c64d6b75303 [web/formwidgets] make default_size a tunable, fix code layout (closes #2165936)