When the French restaurant beneath Eros House in Catford was evicted following complaints of late-night raves-cum-orgies, the new tenants kept its name: Le Bourgeois. It’s an irony not lost on Stephan Dillemuth. Crummy, gleeful, serious, his installations in “Diskodekorationen: From Another Century” literally decorate a disco, or what’d been a sort of disco before theread more