Call drawTextArray with SalLayoutFlags::BiDiRTL if the
text direction of a TextLayout is RTL.

Change-Id: I1a3bfaee5521eea77b44350c21c104cbf72fac97
Reviewed-on: https://gerrit.libreoffice.org/61460
Tested-by: Jenkins
Reviewed-by: Mark Hung <marklh9@gmail.com>