fix fullday/showend conflict #2629

[sdetweil]

1. Base your pull requests against the develop branch.
   yes
2. Include these infos in the description:

• Does the pull request solve a related issue?
• If so, can you reference the issue like this Fixes #<issue_number>?
  Fixes Calendar: end date missing for multi day events (like holidays) (followup to #2529) #2629

• What does the pull request accomplish? Use a list if needed.
  adds else clause
  if showend, then skip check for fullday event
• If it includes major visual changes please add screenshots.
  no visual changes

4. Don't forget to add an entry about your changes to
   the CHANGELOG.md file.
   updated

[codecov-commenter]

Codecov Report

Merging #2829 (cdd8743) into develop (a143ebc) will decrease coverage by 0.35%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2829      +/-   ##
===========================================
- Coverage    65.26%   64.91%   -0.36%     
===========================================
  Files            8        8              
  Lines          285      285              
===========================================
- Hits           186      185       -1     
- Misses          99      100       +1     

Impacted Files	Coverage Δ
js/server.js	66.21% <0.00%> (-1.36%)	⬇️

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