fix(settings): trigger variable watcher on save

[sogehige]

CHECKLIST

• I read contributing docs

[codecov]

Codecov Report

Merging #4451 (c3c64e5) into master (7553d88) will decrease coverage by 0.15%.
The diff coverage is 53.33%.

@@            Coverage Diff             @@
##           master    #4451      +/-   ##
==========================================
- Coverage   55.73%   55.58%   -0.16%     
==========================================
  Files         135      135              
  Lines       14347    14368      +21     
  Branches     2897     2904       +7     
==========================================
- Hits         7996     7986      -10     
- Misses       6351     6382      +31     

Flag	Coverage Δ
mysql	55.34% <53.33%> (-0.04%)	⬇️
postgres	55.36% <53.33%> (-0.18%)	⬇️
sqlite	55.38% <53.33%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
src/bot/helpers/socket.ts	100.00% <ø> (ø)
src/bot/panel.ts	30.37% <20.00%> (-0.02%)	⬇️
src/bot/_interface.ts	56.56% <50.00%> (-0.04%)	⬇️
src/bot/watchers.ts	80.55% <68.00%> (-6.95%)	⬇️
src/bot/general.ts	29.71% <100.00%> (+0.51%)	⬆️
src/bot/main.ts	73.63% <100.00%> (ø)
src/bot/helpers/permissions.ts	92.30% <0.00%> (-7.70%)	⬇️
src/bot/systems/points.ts	62.81% <0.00%> (-7.19%)	⬇️
src/bot/permissions.ts	65.39% <0.00%> (-2.43%)	⬇️
src/bot/systems/moderation.ts	93.47% <0.00%> (-1.04%)	⬇️
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7553d88...c3c64e5. Read the comment docs.