Jump cooldown healthbar flashes even on deselected units

[sprunk]

Amnykon brought it up that perhaps the flashing of jump cooldown healthbar if you have the jump command selected should only happen for selected units.

[GoogleFrog]

Sounds ideal, but I'm not sure what sort of information healthbars has already, and the performance is sort of tight. A solution that only reads unit selection on units with jump bars that could flash (ie at the last conditional) sounds fine. If there is no per-unit flash ability for jump bars (eg if they are drawn in a big batch with one colour) then I am not so sure. I haven't looked at the code in a while.