Remove trailing zeros in time step of exported files

[kaipartmann]

Fixes #162.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.63%. Comparing base (0abbded) to head (f78c153).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
+ Coverage   91.54%   91.63%   +0.09%     
==========================================
  Files          44       44              
  Lines        4256     4258       +2     
==========================================
+ Hits         3896     3902       +6     
+ Misses        360      356       -4     

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