Fix dead time at 30 Hz

[mdoucet]

The number of pulses was not counted correctly. Now it is.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 44.98%. Comparing base (b432f41) to head (3e042c7).

Files	Patch %	Lines
..._ui/interfaces/data_handling/DeadTimeCorrection.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #102      +/-   ##
==========================================
+ Coverage   44.96%   44.98%   +0.02%     
==========================================
  Files          33       33              
  Lines        6310     6307       -3     
==========================================
  Hits         2837     2837              
+ Misses       3473     3470       -3     

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