fix(WebSocketShard): account code 1000 with no prior indication

[didinele]

Please describe the changes this PR makes and why it should be merged:

Status and versioning classification:

[vercel]

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Name	Status	Preview	Updated
discord-js	✅ Ready (Inspect)	Visit Preview	Jul 30, 2022 at 6:27PM (UTC)

[codecov]

Codecov Report

Merging #8399 (89a0935) into main (fca3dad) will decrease coverage by 0.12%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #8399      +/-   ##
==========================================
- Coverage   86.49%   86.36%   -0.13%     
==========================================
  Files          87       87              
  Lines        8278     8290      +12     
  Branches     1104     1104              
==========================================
  Hits         7160     7160              
- Misses       1075     1087      +12     
  Partials       43       43              

Flag	Coverage Δ
builders	100.00% <ø> (ø)
collection	100.00% <ø> (ø)
proxy	73.28% <ø> (ø)
rest	92.53% <ø> (ø)
utilities	100.00% <ø> (ø)
voice	64.08% <ø> (ø)
ws	59.76% <0.00%> (-0.51%)	⬇️

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Impacted Files	Coverage Δ
packages/ws/src/ws/WebSocketShard.ts	22.69% <0.00%> (-0.50%)	⬇️

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