elm_colorselector: modify to select no item when create colorselector
elm_colorselector: modify to select no item when create colorselector

Summary:
Currently, the first item is marked selected when
the colorselector is added. However, this is not normal behavior
since the first item is not shown selected.
Moreover, always selecting the first item during creation does not
sound natural.

Reviewers: cedric, Hermet, woohyun

Differential Revision: https://phab.enlightenment.org/D2906

Signed-off-by: Cedric BAIL <240633aa59d25638de9800ef43a88ad2e208d24d@osg.samsung.com>

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