Change direct prediction for fast first pass to automatic as all other presets

use this mode and it has to be enabled in the first pass to be used in the
second

Originally committed as revision 16474 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffpresets/libx264-fastfirstpass.ffpreset

@@ -15,6 +15,6 @@ qmin=10
 qmax=51
 qdiff=4
 refs=1
-directpred=1
+directpred=3
 trellis=0
 flags2=-bpyramid-wpred-mixed_refs-dct8x8+fastpskip