[minor] fix focus getting trapped on banner #BUX-2863

[jchurin-branch]

Pull Request Template

Description

This PR fixes the focussing not getting trapped into the banner. With this fix, the focussed elements will always be the elements inside the banner.

Fixes # (issue)
https://branch.atlassian.net/browse/BUX-2863

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Unit test
• Integration test

JS Budget Check

Please mention the size in kb before abd after this PR

Files	Before	After
dist/build.js.
dist/build.min.js

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Mentions:

List the person or team responsible for reviewing proposed changes.

cc @BranchMetrics/saas-sdk-devs for visibility.

[github-actions]

Test Results

114 tests   107 ✔️  48s ⏱️
    1 suites      7 💤
    1 files        0 ❌

Results for commit 0b7add7.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (master@8fb9e6d). Click here to learn what that means.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #966   +/-   ##
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  Coverage          ?   25.01%           
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  Files             ?       15           
  Lines             ?     2323           
  Branches          ?        0           
=========================================
  Hits              ?      581           
  Misses            ?     1742           
  Partials          ?        0           

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