Evas textblock: Fixed removing of format pairs in a rare case (range).
Evas textblock: Fixed removing of format pairs in a rare case (range).

Until now, removing the <ps> when <b><ps></b> would have left the
<b></b> intact instead of removing them when using a range delete.

git-svn-id: 6d771e449150288cc513807b7f4d2af31e9482bd@61530 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

TizenChameleon/uifw-evas,TizenChameleon/evas,TizenChameleon/evas,TizenChameleon/uifw-evas,TizenChameleon/evas,TizenChameleon/uifw-evas,TizenChameleon/uifw-evas,TizenChameleon/evas