encodebin - Fix video recording resume failure

encodebin - Fix video recording resume failure

Since GStreamer 1.0, GST_BUFFER_DTS is used with GST_BUFFER_PTS(GST_BUFFER_TIMESTAMP),
but, GST_BUFFER_DTS is not updated in encodebin.
It causes the failure on muxer when resume recording.

[Version] 1.0.0-29
[Profile] Common
[Issue Type] Bug fix
[Dependency module] N/A
[Test] [M(T) - Boot=(OK), sdb=(OK), Home=(OK), Touch=(OK), Version=tizen-3.0-mobile_20161114.3]

Change-Id: Ia58f53a7215162d739845d5368275c77595a67c4
Signed-off-by: Jeongmo Yang <jm80.yang@samsung.com>