encoder: h264: fix pixel-aspect-ratio in encoded stream.

encoder: h264: fix pixel-aspect-ratio in encoded stream.

Really report sample aspect ratio (SAR) as present, and make it match
what we have obtained from the user as pixel-aspect-ratio (PAR). i.e.
really make sure VUI parameter aspect_ratio_info_present_flag is set
to TRUE and that the indication from aspect_ratio_idc is Extended_SAR.

This is a leftover from git commit a12662f.

https://bugzilla.gnome.org/show_bug.cgi?id=740360

Change-Id: I092ef22038c4862dae645d58c59be0cd5b506fc5
Bug-Tizen: TC-2113/part
Origin: upstream