textEditTest in qaccessibility test was using QTextEdit::setCurrentFont
on second pass, but that did not change the font used for text in any way.
I don't know what was the purpose. So I changed it into something that
made sense to me and actually tests text with a different font on second pass.
Also fixed characterRect function in tests to use correct font/format.
Change-Id: I3663e02abda381be1401e298c15b51cd0fb75939
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>