[Gameplay][Balance] Reduce bolt and cata prepare time to help with responsiveness/feel

Reduce prepare time for catapults and bolt shooters. Catapults have recently been nerfed and buffed with a small splash attack. Bolt shooters are a little underutilized. Both of these units share a 'clunkiness' which is due to their pack/unpack time, minimum range, and long prepare time. This patch hopes to address part of this clunkiness by decreasing the prepare time for catas and bolt shooters. This makes the unit seem more responsive to new commands to attack a different unit/structure.

Patch by: @real_tabasco_sauce
Accepted by: @wowgetoffyourcellphone
Comments by: @chrstgtr, @Freagarach

Differential revision: https://code.wildfiregames.com/D5131