flipselector.edc: array size +1 to prevent loosing last character.

flipselector.edc: array size +1 to prevent loosing last character.

Summary:
Flipselector lose last character when 50 characters showing case.

This defined value will using in snprintf, fetch_str(_edje_embryo_fn_fetch_str).
As you already know, we have to give the location in array for '\n'.

Test Plan: Give the 50 characters for flipselector text.

Reviewers: Hermet, cedric

Reviewed By: cedric

Differential Revision: https://phab.enlightenment.org/D3064

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