update icon: lua (original, original-wordmark, plain, plain-wordmark, line, line-wordmark)

[canaleal]

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 as seen here

This PR is related to #1998

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

• Lua website
• Lua github

Additional Notes

Used the color #000080 for the font SVGs.

All 3 versions were created as the Original SVGs had 2 colors; Navy for the planet/moon and gray for the orbit path.

[weh]

LGTM 👍

i only asked myself, if the "non-wordmark" versions really are official, or needed. but since the plain ones already existed, i think its ok

[lunatic-fox]

As @weh commented and as far as I see there are no "non-wordmark" versions for this icon.

• The original version has "Lua" in #ffffff.
  original

Perhaps, we should make these changes:

• Rename original-wordmark to original, delete original-wordmark. Alias original as original-wordmark.
• Rename plain-wordmark to plain, delete plain-wordmark. Alias plain as plain-wordmark.
• Rename line-wordmark to line, delete line-wordmark. Alias line as line-wordmark.

[Snailedlt]

LGTM! ✔️
Looks Great! 💯 Thank you for another great PR! 🙇‍♂️