Fixed a typo in Italian autotext TE

Change-Id: Ied020950669930ef657a9269ced7168d64f4313e
Reviewed-on: https://gerrit.libreoffice.org/45627Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>