use ability num instead of alt ability

include/global.h

@@ -240,7 +240,7 @@ struct BattleTowerPokemon
     u32 spAttackIV:5;
     u32 spDefenseIV:5;
     u32 gap:1;
-    u32 altAbility:1;
+    u32 abilityNum:1;
     u32 personality;
     u8 nickname[POKEMON_NAME_LENGTH + 1];
     u8 friendship;
@@ -287,7 +287,7 @@ struct RentalMon
     u16 monId;
     u32 personality;
     u8 ivs;
-    u8 abilityBit;
+    u8 abilityNum;
 };
 
 struct BattleDomeTrainer