Merge pull request #1391 from armhold/b2-listmax

pass in defaultListMaxItems to b2Backend constructor

internal/backend/b2/b2.go

@@ -70,6 +70,7 @@ func Open(cfg Config, rt http.RoundTripper) (restic.Backend, error) {
 			Join: path.Join,
 			Path: cfg.Prefix,
 		},
+		listMaxItems: defaultListMaxItems,
 		sem:          sem,
 	}
 
@@ -110,6 +111,7 @@ func Create(cfg Config, rt http.RoundTripper) (restic.Backend, error) {
 			Join: path.Join,
 			Path: cfg.Prefix,
 		},
+		listMaxItems: defaultListMaxItems,
 		sem:          sem,
 	}