[kde-edu]: fix bug in kbruch that the setting of "Mixed Number" in Answer section isn't save

[Nadav Vinik]

-------------- next part --------------
A non-text attachment was scrubbed...
Name: mainqtwidget.cppmainqtwidget.cpp.diff
Type: text/x-patch
Size: 823 bytes
Desc: not available
Url : http://mail.kde.org/pipermail/kde-edu/attachments/20090122/33269186/attachment.diff