Apply button emits accepted() signal

This has the consequence of making certain changes appear in the view
when the Apply button is clicked, which wasn't happening after a
recent change.

Change-Id: Ia24e408fdec33bfa861aa4c23e8c6c51401c7571
Merge topic 'fix_proxy_widget_dialog_apply' into next

ae1f7a9c Apply button emits accepted() signal