Fix warnings as a follow up issue after added Container wrapper ID field to the advanced section settings tab

Problem/Motivation

Follow up issue after #3252219: Add Container wrapper ID field to the advanced section settings tab

Warning: Undefined array key "container_wrapper_id" in Drupal\varbase_layout_builder\Plugin\Layout\VarbaseLayoutBuilderBootstrapLayout->buildConfigurationForm() (line 504 of /app/docroot/modules/contrib/varbase_layout_builder/src/Plugin/Layout/VarbaseLayoutBuilderBootstrapLayout.php) #0 /app/docroot/core/includes/bootstrap.inc(346): _drupal_error_handler_real(2, 'Undefined array...', '/app/docroot/mo...', 504)

Proposed resolution

Use the parent::defaultConfiguration and the defaultConfiguration to reset the value for the Container wrapper ID

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Release Varbase 9.0.9, varbase_layout_builder-10.0.20

Varbase update type:

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

• N/A

API changes

• N/A

Data model changes

• Issue #3266114 by abu-zakham: Fixed warnings as a follow up issue after added Container wrapper ID field to the advanced section settings tab