fix: styles for share video functionality of the video xblock

[ihor-romaniuk]

Description

This pull request contains styling fixes for the Share this video functionality for LMS and CMS. Hardcoded styles were also removed and a link to platform brand styles/colors was added.

Related Pull Requests

PR to the master branch: #34808
PR to the open-release/redwood.master branch: #34893

Screenshots before:

LMS	LMS	CMS	CMS

Screenshots after:

LMS	LMS	CMS	CMS

Steps to Reproduce:

1. Enable new video editor and sharing by adding in /admin/waffle/flag/

• video_config.public_video_share
• new_core_editors.use_new_video_editor

2. In studio open unit -> add new component -> video -> in Social Sharing block enable check-box, save
3. Open unit in LMS

[openedx-webhooks]

Thanks for the pull request, @ihor-romaniuk!

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