[#668] shard/test: Do not alter rootPath option

Supposedly, this was added to allow creating 2 different shards without
subtest. Now we use t.TempDir() everywhere, so this should not be a
problem.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/local_object_storage/shard/shard_test.go

@@ -54,7 +54,6 @@ func newCustomShard(t testing.TB, enableWriteCache bool, o shardOptions) *Shard
 
 	var sh *Shard
 	if enableWriteCache {
-		o.rootPath = filepath.Join(o.rootPath, "wc")
 		switch o.wcOpts.Type {
 		case writecacheconfig.TypeBBolt:
 			o.wcOpts.BBoltOptions = append(
@@ -65,8 +64,6 @@ func newCustomShard(t testing.TB, enableWriteCache bool, o shardOptions) *Shard
 				[]writecachebadger.Option{writecachebadger.WithPath(filepath.Join(o.rootPath, "wcache"))},
 				o.wcOpts.BadgerOptions...)
 		}
-	} else {
-		o.rootPath = filepath.Join(o.rootPath, "nowc")
 	}
 
 	if o.bsOpts == nil {