ShadowBlitz EnemyIsInBox() fix.

bool EnemyIsInBox(npc enemy, int x1, int y1, int x2, int y2)
{
    if (x1 > enemy->X+enemy->HitWidth ) return false;
    if ( x2 < enemy->X ) return false;
    if ( y1 > enemy->Y+enemy->HitHeight ) return false;
    if ( y2 < enemy->Y) return false;
    return true;
}