libavformat/tee: tee was passing a wrong option name for fifo's format_options

If fifo is enabled on tee muxer, ffmpeg exits because of an unknown option passed to fifo muxer.
Option name "format_options" was replaced by "format_opts" on tee muxer.
Signed-off-by: Felipe Astroza <felipe@astroza.cl>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/tee.c

@@ -208,7 +208,7 @@ static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
             if (ret < 0)
                 goto end;
 
-            ret = av_dict_set(&tee_slave->fifo_options, "format_options", format_options_str,
+            ret = av_dict_set(&tee_slave->fifo_options, "format_opts", format_options_str,
                               AV_DICT_DONT_STRDUP_VAL);
             if (ret < 0)
                 goto end;