gengrid : remove elm_access_text_set for code consistancy.
Early accessibility read object and item infomations by elm_access_text_set
but this code is redundant now and removed genlist and list already.
To make a same consistancy of our accessibility informations in list-look widgets
we need to remove this function calls here.
Test Plan: tested Gengrid Item is not readed in gengrid item focused with accessibility on.
Differential Revision: https://phab.enlightenment.org/D7370