Minor code simplify

lib/battle/CBattleInfoCallback.cpp

@@ -857,9 +857,7 @@ AccessibilityInfo CBattleInfoCallback::getAccesibility() const
 
 	//special battlefields with logically unavailable tiles
 	std::vector<BattleHex> impassableHexes;
-	switch(battleGetBattlefieldType().num)
-	{
-	case BFieldType::SHIP_TO_SHIP:
+	if(battleGetBattlefieldType().num == BFieldType::SHIP_TO_SHIP)
 		impassableHexes = 
 		{ 
 			6, 7, 8, 9,
@@ -872,8 +870,6 @@ AccessibilityInfo CBattleInfoCallback::getAccesibility() const
 			159, 160, 161, 162, 163,
 			176, 177, 178, 179, 180
 		};
-		break;
-	}
 	for(auto hex : impassableHexes)
 		ret[hex] = EAccessibility::UNAVAILABLE;