Close the search field once a user is selected

[LivOriona]

In the module for adding users to a WSP or subgroup, each time a user is selected from the list (after searching for a character string), the drop-down list of users matching that same search must automatically be closed.

[Clementine46]

This makes sense considering the number of users who will be present on the instance. The chances of selecting multiple users at once are very low so it's better to automatically prepare for a potential new research after a user has been selected.

[LivOriona]

Tested, validated 🎵 thanks!