LatinIME: recode setup video

avconv -i setup_welcome_video.mp4 -an -vb 150000 -y -strict experimental out/setup_welcome_video.mp4

Size change: 459085 -> 182345 bytes

Change-Id: I7fb475319de918ba16a8fcb9bc36609c22cd12e6
Merge "LatinIME: recode setup video" into cm-11.0