Remove functions related with setting mode

Remove functions related with setting mode

- Issue:
Client mode information is already set in ttsd_server_initialize().

- Solution:
This patch removes functions that are releated with setting mode. These
functions are not neccessary anymore because mode information is already
set on ttsd_server_initialize().

Change-Id: Ic5f08edd9c98c4e5c34fd3d724de778f57e7991d
Signed-off-by: Suyeon Hwang <stom.hwang@samsung.com>