Update ajax_layout.html.twig

Avoid overflowing content in modal dialog caused by negative margins on row class
Update base_list.html.twig

Added missing class sonata-ba-list to trigger CSS rule that display select button on sonata_type_model_list
Update list__select.html.twig

Change link target to enable on click selection
Merge pull request #2629 from julien-maitan/master

Enable select button on sonata_type_model_list
Merge pull request #2628 from julien-maitan/patch-1

Update ajax_layout.html.twig
Merge remote-tracking branch 'sonata-project/master'