fix(Activity): Fix equals() not checking for differing emoji

[Eejit43]

This PR fixes Activity.equals() not checking for differing emojis, leading presenceUpdate to not fire if only a custom status emoji was updated.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

[vercel]

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Name	Status	Preview	Updated
discord-js	✅ Ready (Inspect)	Visit Preview	Nov 25, 2022 at 5:12PM (UTC)
discord-js-guide	✅ Ready (Inspect)	Visit Preview	Nov 25, 2022 at 5:12PM (UTC)

[codecov]

Codecov Report

Merging #8841 (dfc455d) into main (d275480) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head dfc455d differs from pull request most recent head 38e6b3d. Consider uploading reports for the commit 38e6b3d to get more accurate results

@@            Coverage Diff             @@
##             main    #8841      +/-   ##
==========================================
- Coverage   85.63%   85.61%   -0.03%     
==========================================
  Files          96       96              
  Lines        9475     9459      -16     
  Branches     1137     1134       -3     
==========================================
- Hits         8114     8098      -16     
  Misses       1319     1319              
  Partials       42       42              

Flag	Coverage Δ
brokers	65.24% <ø> (ø)
builders	98.65% <ø> (ø)
collection	100.00% <ø> (ø)
proxy	81.53% <ø> (ø)
rest	91.97% <ø> (ø)
util	100.00% <ø> (ø)
utilities	100.00% <ø> (ø)
voice	63.70% <ø> (ø)
ws	59.83% <ø> (ø)

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Impacted Files	Coverage Δ
packages/collection/src/collection.ts	100.00% <0.00%> (ø)

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