fix(customvariable): log warning on unprivileged variable change

[sogehige]

Fixes #4528

CHECKLIST

• I read contributing docs

[codecov]

Codecov Report

Merging #4534 (6559909) into master (8f5ed8a) will increase coverage by 0.01%.
The diff coverage is 82.00%.

@@            Coverage Diff             @@
##           master    #4534      +/-   ##
==========================================
+ Coverage   57.18%   57.20%   +0.01%     
==========================================
  Files         250      256       +6     
  Lines       15237    15285      +48     
  Branches     2939     2946       +7     
==========================================
+ Hits         8714     8744      +30     
- Misses       6523     6541      +18     

Flag	Coverage Δ
mysql	57.05% <82.00%> (-0.07%)	⬇️
postgres	57.08% <82.00%> (+0.15%)	⬆️
sqlite	57.02% <82.00%> (+0.22%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/bot/helpers/points/getPointsName.ts	46.66% <46.66%> (ø)
src/bot/filters/price.ts	62.50% <50.00%> (ø)
src/bot/integrations/discord.ts	19.53% <50.00%> (ø)
src/bot/permissions.ts	46.61% <50.00%> (-4.93%)	⬇️
src/bot/systems/bets.ts	67.93% <50.00%> (+1.26%)	⬆️
src/bot/systems/price.ts	54.95% <66.66%> (+4.04%)	⬆️
src/bot/systems/userinfo.ts	49.44% <75.00%> (ø)
src/bot/filters/list.ts	71.31% <85.00%> (ø)
src/bot/_interface.ts	55.97% <88.88%> (+0.41%)	⬆️
src/bot/games/duel.ts	98.27% <100.00%> (+0.01%)	⬆️
... and 25 more

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