cubicweb-mediaplayer #16754044 Fix BitesDate titles [validation pending]

Fix BitesDate titles (do not add duplicated extension)

prioritynormal
typebug
done in0.2.2
load0.100
load left0.000
closed by#97798e7ed708 Use the right extension in FileBytes data name
patchUse the right extension in FileBytes data name [applied]