venc: remove jpeg from bitrate calculation
venc: remove jpeg from bitrate calculation

JPEG doesn't use the bitrate field.

Signed-off-by: Felipe Contreras <de77a8b9cd239b204c19c52ed62e48ab47243362@gmail.com>

felipec/gst-dsp,felipec/gst-dsp,community-ssu/gst-dsp,community-ssu/gst-dsp,community-ssu/gst-dsp