ST. LOUIS — Logan Webb was clearly still seeking to rediscover his top-line form, but that didn’t matter Friday night against the Cardinals — for the Giants, or for his pitching line. Webb issued more walks (3) than he generated swings and misses. He put four men on via various free passes before surrendering a hit. But when it was over, an 8-2 Giants victory, Webb walked away with his MLB-leading fifth win and the Giants with their sixth straight victory, their longest win streak of the season. As catcher Curt Casali, who hit his first home run of the season Friday night, said earlier this we…