cubicweb #2419040 too restrictive actions box selector [validation pending]

This box selector use non_final_entity selector, while nothing prevent it to run without that condition met. The actions box display condition should simply be availibility of some actions.

done in3.15.2
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closed by#b5b263f1ad67 [ui] actions box should be displayed if there are some actions, not if context is an entity. Closes #2419040
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