player: Set stop type as GST_SEEK_TYPE_SET when generate seek event with rate>=0.0
audio fast rewind then fast forward, mpegaudioparse won't update stop time to segment and take the first seek's stop time if stop type is GST_SEEK_TYPE_NONE. And audio will exit with eos directly at this stop time at second seek.
Need to set stop type as GST_SEEK_TYPE_SET when gst-player generate seek event to let audio keeps the desired stop time when seek with rate>=0.0