Cleanup more callback things

[rejas]

Looks quite stable on my computers, so maybe we give it a try?

[codecov-commenter]

Codecov Report

Merging #3051 (880eef3) into develop (b5b6124) will increase coverage by 0.08%.
The diff coverage is 38.01%.

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@@             Coverage Diff             @@
##           develop    #3051      +/-   ##
===========================================
+ Coverage    22.99%   23.07%   +0.08%     
===========================================
  Files           52       52              
  Lines        11593    11578      -15     
===========================================
+ Hits          2666     2672       +6     
+ Misses        8927     8906      -21     

Impacted Files	Coverage Δ
js/loader.js	0.00% <0.00%> (ø)
js/main.js	0.00% <0.00%> (ø)
js/module.js	0.00% <0.00%> (ø)
js/server.js	95.90% <83.33%> (+0.10%)	⬆️
js/app.js	80.89% <88.88%> (-0.25%)	⬇️
js/node_helper.js	98.61% <100.00%> (-0.01%)	⬇️
modules/default/updatenotification/node_helper.js	90.27% <0.00%> (+12.50%)	⬆️

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