Fix TlmGrapher end time

[jmthomas]

closes #715

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3b5e4c9) 72.76% compared to head (f631e75) 72.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #722   +/-   ##
=======================================
  Coverage   72.76%   72.76%           
=======================================
  Files         470      470           
  Lines       30589    30589           
  Branches      889      889           
=======================================
  Hits        22257    22257           
  Misses       8240     8240           
  Partials       92       92           

Flag	Coverage Δ
ruby-api	50.85% <ø> (ø)
ruby-backend	80.71% <ø> (ø)

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