fix(tmi): subgifts should be properly incremented

[sogehige]

Fixes https://discord.com/channels/317348946144002050/619437014001123338/797823767001825300

CHECKLIST

• I read contributing docs

[codecov]

Codecov Report

Merging #4536 (ed291ca) into master (601a010) will decrease coverage by 0.23%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #4536      +/-   ##
==========================================
- Coverage   57.35%   57.12%   -0.24%     
==========================================
  Files         256      256              
  Lines       15285    15291       +6     
  Branches     2946     2948       +2     
==========================================
- Hits         8767     8735      -32     
- Misses       6518     6556      +38     

Flag	Coverage Δ
mysql	57.04% <0.00%> (-0.03%)	⬇️
postgres	57.02% <0.00%> (-0.22%)	⬇️
sqlite	56.90% <0.00%> (-0.09%)	⬇️

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Impacted Files	Coverage Δ
src/bot/tmi.ts	36.66% <0.00%> (-0.50%)	⬇️
...elpers/permissions/recacheOnlineUsersPermission.ts	70.00% <0.00%> (-23.34%)	⬇️
src/bot/helpers/permissions/cache.ts	92.00% <0.00%> (-8.00%)	⬇️
src/bot/systems/points.ts	65.55% <0.00%> (-7.70%)	⬇️

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