Merge pull request #6002 from kdmcser/opening_battle_spells

Add addInfo support for OPENING_BATTLE_SPELL to set spell level

lib/json/JsonBonus.cpp

@@ -225,6 +225,7 @@ static void loadBonusAddInfo(CAddInfo & var, BonusType type, const JsonNode & va
 		case BonusType::DARKNESS:
 		case BonusType::FULL_MAP_SCOUTING:
 		case BonusType::FULL_MAP_DARKNESS:
+		case BonusType::OPENING_BATTLE_SPELL:
 			// 1 number
 			var = getFirstValue(value).Integer();
 			break;