fix typo: usefull --> useful
fix typo: usefull --> useful

Change-Id: Ib6b8be0502a905b4ca7c6f8f2d4213f3a85c4c4f
Reviewed-on: https://gerrit.libreoffice.org/34997
Reviewed-by: Adolfo Jayme Barrientos <978aef1383ff7c89a424f1d44ea77bde9ab919ad@ubuntu.com>
Tested-by: Adolfo Jayme Barrientos <978aef1383ff7c89a424f1d44ea77bde9ab919ad@ubuntu.com>

LibreOffice/libcdr,LibreOffice/libcdr,LibreOffice/libcdr,LibreOffice/libcdr