E3S7A.1: Disable recruitment_save_gold aspect for most AI sides on 1.11.7+

These AI sides have a lot of units or units with a lot of HP, which
results in them idling instead of recruiting given the small size of
Elynia's party.
E3S7B: Configure AI for sides 7 through 13 during scenario initialization

Someone mentioned at some point that [modify_side] may not work with
aspect-based AI configuration in some cases. We want to be on the safe
side here.
E3S7B: Disable the recruitment_save_gold AI aspect for sides 7 through 13

My last playthrough shows that the aspect performs badly because of the
sheer amount of units some of these sides have. We might as well disable
it for all of them.