update icon: motion(original, plain)

[Yashh56]

Double check these details before you open a PR

• PR does not match another non-stale PR currently opened
• PR name matches the format new icon: Icon name (versions separated by comma). More details here
• PR's base is the develop branch.
• Your icons are inside a folder as seen here
• SVG matches the standards laid out here
• A new object is added in the devicon.json file at the correct alphabetic position as seen here

This PR closes #2545

Link to prove your SVG is correct and up-to-date.

[github-actions]

Hi!

I'm the check-bot and we have some issues with your PR:

The PR's base branch is `master`, but should be `develop`
Please change the PR so that it's based on, and merged into `develop`

Check our CONTRIBUTING guide for more details regarding these errors.

Please address these issues. When you update this PR, I will check your SVGs again.

Thanks for your help,
SVG-Checker Bot 😄