Changes: ut_mtextedit: use SimpleInputContext for all cases
Changes: ut_mtextedit: use SimpleInputContext for all cases

RevBy: Pekka Vuorela
Details: more importantly, don't leak instances from one case to another.

nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch