[web] consider inlined relations in has_editable_relation. Closes #3049970 In some cases where the user can only add/edit inlined relations (though actually edit perms of the inlined relation doesn't seem checked), the "modify" action doesn't appear while it should.

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    $('a.rhythm').click(function (event){
        $('div#pageContent').toggleClass('rhythm_bg');
        $('div#page').toggleClass('rhythm_bg');
        event.preventDefault();
    });
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