Fixed miss called property in getStoreIdByCode method

[maxalmonte14]

Description (*)

This PR solves the problem addressed in https://github.com/magento-engcom/import-export-improvements/issues/134

Fixed Issues (if relevant)

1. https://github.com/magento-engcom/import-export-improvements/issues/134: Clean up Model/Import/Product/Type/Bundle.php

Manual testing scenarios (*)

1. Run ./vendor/bin/phpstan analyse app/code/Magento/BundleImportExport/Model/Import/Product/Type/Bundle.php as described in https://github.com/magento-engcom/import-export-improvements/issues/134, after this implementation the following error shouldn't be present

------ ------------------------------------------------------------------------------------------------------------------------------------------
  Line   Bundle.php
 ------ ------------------------------------------------------------------------------------------------------------------------------------------
  782    Access to an undefined property Magento\BundleImportExport\Model\Import\Product\Type\Bundle::$storeIdToCode.
 ------ ------------------------------------------------------------------------------------------------------------------------------------------

Contribution checklist (*)

• [x] Pull request has a meaningful description of its purpose
• [x] All commits are accompanied by meaningful commit messages
• [ ] All new or changed code is covered with unit/integration tests (if applicable)
• [ ] All automated tests passed successfully (all builds on Travis CI are green)

[dmanners]

Hello, thank you for your pull request. I will start to process this PR and get back to you if I need any more information.

[magento-engcom-team]

@maxalmonte14 thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

[dmanners]

Hi @maxalmonte14 I push 1 commit to this branch (https://github.com/magento-engcom/import-export-improvements/pull/143/commits/b552406f8e1bd7cc5b33b37bdc4e8b757883e0de) to fix some php code style issues.

[maxalmonte14]

@dmanners excellent 👌