Update code for device state changed callback

Update code for device state changed callback

Do not call recorder_get_device_state in device state changed callback.
The value from the signal is changed, so don't need to call it in callback.

[Version] 0.2.40
[Profile] Common
[Issue Type] Update
[Dependency module] libmm-camcorder, mmsvc-recorder
[Dependency commit] 6012f7ec5032f940e8446a7aec9a9ee001ba05c6, 19f8d3f79e6df3a6133b70babd28c5eb59f5d514
[Test] [M(T) - Boot=(OK), sdb=(OK), Home=(OK), Touch=(OK), Version=tizen-mobile_20161007.1]

Change-Id: Ie035ece78dd390e1bc54c4b5e169c99b327760ed
Signed-off-by: Jeongmo Yang <jm80.yang@samsung.com>