Fix name for builder in farm connection

Ensure that the map of builders we create links the
builder name and not the farm name to the image engine
of that node. This was a regression introduced during the
farm conf rework.

Signed-off-by: Urvashi Mohnani <umohnani@redhat.com>

pkg/farm/farm.go

@@ -61,7 +61,7 @@ func newFarmWithBuilders(_ context.Context, name string, cons []config.Connectio
 			defer fmt.Printf("Builder %q ready\n", con.Name)
 			builderMutex.Lock()
 			defer builderMutex.Unlock()
-			farm.builders[name] = engine
+			farm.builders[con.Name] = engine
 			return nil
 		})
 	}