[MAINTAIN-10] fixed a white background for local video in Safari browser

[aleevas]

Original Issue, this PR is going to fix: #1164
Jira issue MAINTAIN-10

This one should fix white background for Location Video on Safari browser for all 3 themes.
How it looks before this fix:
Rose:

Lily:

Carnation:

How it should looks after fix:
Rose:

Lily:

Carnation:

Steps for review

• log as admin.
• create a new Landing page (Please fiil all fields: Title, Layout->One Column)
• in Content Area pleas add a new Simple content paragraph
• in this paragraph please add a new media entty Local video
  
• save and check on Safari browser
• Go to the /admin/appearance page
• change theme and check for new theme

General checks

• All coding styles are fulfilled and there are no any issues reported by CodeSniffer. See Code of Conduct.
• Documentation has been updated according to PR changes.
• Steps for review have been provided according to PR changes.
  
• Make sure you've provided all necessary hook_update_N to support upgrade path.
• Make sure your git email is associated with account on drupal.org, otherwise you won't get commits there.
  
• If you would like to get credits on drupal.org, check documentation.

Thank you for your contribution!

[gundevel]

Can one of the admins verify this patch? Use "o+k to test" or ''t+est this please" for manual build execution.

[hamrant]

Code looks ok

[hamrant]

ok to test

[gundevel]

Build comment file:

Check Open Y Installation Wizard at http://install.openy.cibox.tools/build3120/install.php

---

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
http://openy.cibox.tools:8080/job/PR_BUILDER_COMPOSER/3120/

[gundevel]

Open Y Upgrade Path site check installed at http://upgrade.openy.cibox.tools/build3120/

[ekaterina-samuseva]

Fix was checked on iPhone 11 Pro, iOS 14.1, Safari
Page with added local video: http://upgrade.openy.cibox.tools/build3120/ekaterina-test