fdo#82502 Ctrl-F should select the text in the search bar, not close it

Change-Id: Ica9851e66e8d8f32b8e353c0b2e541c7ce7d45e3
Reviewed-on: https://gerrit.libreoffice.org/11110
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>