fdo#56512 fix RTF import of non-unicode Hebrew text
fdo#56512 fix RTF import of non-unicode Hebrew text

The trick here is that we can't just fall back to Hebrew encoding for
the whole document, as that would mirror shapes as well. Instead, check
where \rtlch is used, and there fall back to the default encoding.

Change-Id: Iaf155912fab6a559ed165870b8524c23cabcb86d

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core