Removing sleep command.

- Per testing, a migration error does not happen with an Azure deployment.

Author: Aleksandr Melnikov

db/20200528140124_add_cvat_workspace_template.go

@@ -116,7 +116,6 @@ func init() {
 
 func Up20200528140124(tx *sql.Tx) error {
 	// This code is executed when the migration is applied.
-	//time.Sleep(2 * time.Second)
 
 	client, err := getClient()
 	if err != nil {