Improve the Search Folder form

[Alex]

As it is the form will start with a selector to select the parent folder and with a checkbox to search on the subfolders unselected.

This makes little sense, because if you don't check the "Search in subfolders" checkbox, nothing is found

When you select a parent folder the checkbox should automatically be checked otherwise the user may think that the search is not working.

​https://logicaldoc.freshdesk.com/a/tickets/8607