[#166] Fix getting s3 object with the FrostFS OID name

Prioritize getting s3 object with the key, which equals to valid FrostFS OID, rather than getting non-existent object with OID via native protocol for GET and HEAD requests

Signed-off-by: Nikita Zinkevich <n.zinkevich@yadro.com>

cmd/http-gw/app.go

@@ -508,10 +508,10 @@ func (a *app) Serve() {
 		close(a.webDone)
 	}()
 
-	handler := handler.New(a.AppParams(), a.settings, tree.NewTree(frostfs.NewPoolWrapper(a.treePool)), workerPool)
+	handle := handler.New(a.AppParams(), a.settings, tree.NewTree(frostfs.NewPoolWrapper(a.treePool)), workerPool)
 
 	// Configure router.
-	a.configureRouter(handler)
+	a.configureRouter(handle)
 
 	a.startServices()
 	a.initServers(a.ctx)