After replacing a misspelled word, impress wasn't updating the screen
in outline or normal mode. This is attempt #2.

Change-Id: I3eb213a951d55faf9f5b36392f37bf2263851247
Reviewed-on: https://gerrit.libreoffice.org/34406Tested-by: Justin Luth <justin_luth@sil.org>
Reviewed-by: Justin Luth <justin_luth@sil.org>