move calendar tests from category electron to e2e

[khassel]

related to #2408

Calendar tests are now running without electron.

[codecov-commenter]

Codecov Report

Merging #2683 (1d12e57) into develop (e4a0a51) will decrease coverage by 1.36%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2683      +/-   ##
===========================================
- Coverage    70.83%   69.46%   -1.37%     
===========================================
  Files           13        8       -5     
  Lines          696      262     -434     
===========================================
- Hits           493      182     -311     
+ Misses         203       80     -123     

Impacted Files	Coverage Δ
js/app.js	59.66% <0.00%> (-10.09%)	⬇️
modules/default/calendar/calendarfetcher.js
js/node_helper.js
modules/default/calendar/calendarutils.js
modules/default/calendar/node_helper.js
js/class.js

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