update icon: illustrator (plain, line)

[Anjellyrika]

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

This PR closes #1655

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✨ This PR updates the Adobe Illustrator icons in line with Adobe's brand identity change. Also added an 'original' version of the icon that was previously missing, sourced from Wikimedia Commons.