gengrid: no need to loop in case of reorder mode is enabled
gengrid: no need to loop in case of reorder mode is enabled

There is no need to loop when reorder mode is enabled. This looks
ugly and nobody wants it. This fault was introduced in 7aaa5c8d0a4a5714b4f1bf79e

This patch also fixes following crash
   1. elementary_test -to "Gengrid 2".
   2. Enable all the options available.
   3. Do reorder of item via keys.
   4. Observe segv on reordering edge items.

@fix

rvandegrift/elementary,rvandegrift/elementary,rvandegrift/elementary,rvandegrift/elementary