AI: do not use the recruit_rushers CA as default recruitment

It is too different from previous default recruiting and would significantly affect scenario balance. It also currently does not work with multiple leaders and many of the aspects. It will be made available as an option (and is already in the Experimental AI) after these shortcomings have been fixed.

data/ai/ais/ai_default_rca.cfg

@@ -13,13 +13,12 @@
         id=main_loop
         name=ai_default_rca::candidate_action_evaluation_loop
         {AI_CA_GOTO}
-        {AI_CA_RECRUIT_RUSHERS}
         {AI_CA_CASTLE_SWITCH}
         {AI_CA_RETREAT_INJURED}
         # Todo: use grab_villages CA after improvements to unit/village distribution
         #{AI_CA_GRAB_VILLAGES}
         {AI_CA_SPREAD_POISON}
-        #{AI_CA_RECRUITMENT}
+        {AI_CA_RECRUITMENT}
         {AI_CA_MOVE_LEADER_TO_GOALS}
         {AI_CA_MOVE_LEADER_TO_KEEP}
         {AI_CA_HIGH_XP_ATTACK}