Show byte offsets in multiplexed view as well

[rmarx]

Good suggestion from Wouter Vanmontfort to also show byte-offsets in the multiplexed view as well to make it clear which parts are being sent first (this info is also visible per-stream on the bottom, but in a slightly different way, and I think this change makes a lot of sense):

Maybe @LPardue has some opinions on this as well?

[LPardue]

Looks good!