feat(moderation): hide forbidden words until textarea is focused

[sogehige]

Fixes #4611

CHECKLIST

• I read contributing docs

[codecov]

Codecov Report

Merging #4612 (00ca5ab) into master (f388ba7) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4612      +/-   ##
==========================================
+ Coverage   58.26%   58.27%   +0.01%     
==========================================
  Files         269      269              
  Lines       15877    15877              
  Branches     3057     3057              
==========================================
+ Hits         9250     9252       +2     
+ Misses       6627     6625       -2     

Flag	Coverage Δ
mysql	57.85% <ø> (+<0.01%)	⬆️
postgres	57.74% <ø> (+0.02%)	⬆️
sqlite	58.03% <ø> (+0.12%)	⬆️

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Impacted Files	Coverage Δ
src/bot/systems/moderation.ts	92.49% <ø> (ø)
src/bot/systems/levels.ts	62.30% <0.00%> (-0.40%)	⬇️
src/bot/systems/bets.ts	68.47% <0.00%> (+1.63%)	⬆️

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