Add `firefox-nightly` to browser names

[rymiel]

Akin to #111, #120, #121, #204, et al.

I cannot tell you why there's so much variance in these names, but the extension has not worked for me until I added this line.

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:rocket:	This description was created by Ellipsis for commit b9d75c9f05b132a89a31342b64e9b2b96c3aee11

Summary:

Add 'firefox-nightly' to recognized Firefox browser names in src/queries.ts.

Key points:

• Add 'firefox-nightly' to browser_appnames in src/queries.ts.
• Ensures compatibility with Firefox Nightly browser variant.

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