Increase the avi extractor's confidence slighly over mp3's
Increase the avi extractor's confidence slighly over mp3's

So that we don't accidentally identify a .avi file containing an mp3 track as
an mp3 file.

Change-Id: I73495b80cbb5bc1007bf810f2db453c9f175171b
related-to-bug: 5288189

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base