schroenc: Don't touch gop_structure by default, it should be left adaptive

Originally committed as revision 23025 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/libschroedingerenc.c

@@ -153,9 +153,6 @@ static int libschroedinger_encode_init(AVCodecContext *avccontext)
             schro_encoder_setting_set_double(p_schro_params->encoder,
                                              "enable_noarith", 1);
     } else {
-        schro_encoder_setting_set_double(p_schro_params->encoder,
-                                         "gop_structure",
-                                         SCHRO_ENCODER_GOP_BIREF);
         avccontext->has_b_frames = 1;
     }