Resolves: fdo#72233 too long style names over-stretch dialog

Change-Id: Id6f102a3def1928ad8f6b4d27eb32f8c69bdba49
Reviewed-on: https://gerrit.libreoffice.org/8084
Tested-by: Kohei Yoshida <libreoffice@kohei.us>
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>