Fix Modify Task Wizard

[sarahd93]

The radio buttons in the Modify Task Wizard were not working due to a missing convert function.

Also the calculated date of the schedule was wrong since day() returns the day of the week and not the day of the month. Use date() instead. (See also https://momentjs.com/docs/#/get-set/date/)

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2340 into gsa-9.0 will increase coverage by 0.01%.
The diff coverage is 80.00%.

@@             Coverage Diff             @@
##           gsa-9.0    #2340      +/-   ##
===========================================
+ Coverage    50.25%   50.26%   +0.01%     
===========================================
  Files         1070     1070              
  Lines        25159    25163       +4     
  Branches      7117     7119       +2     
===========================================
+ Hits         12644    12649       +5     
+ Misses       11370    11369       -1     
  Partials      1145     1145              

Impacted Files	Coverage Δ
gsa/src/gmp/commands/wizard.js	9.23% <0.00%> (ø)
gsa/src/web/pages/schedules/details.js	12.50% <ø> (ø)
gsa/src/web/wizard/modifytaskwizard.js	20.00% <ø> (ø)
gsa/src/gmp/models/event.js	22.91% <100.00%> (+2.17%)	⬆️

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