Bug Fix Intersect Filter

[theHenks]

The initial condition of y_high_counter checks for > threshold, while the update condition of y_is_high in the loop checks for >= threshold.
In cases, where the first value of the waveform is exactly the threshold value, this return the first index as result, which throws an error in the @assert at the end of the loop.
This is fixed now.
The error occurs in case the waveform of the FADC saturates and has 0s exclusively.
Bug found by @LisaSchlueter and fixed by @fhagemann :)

[codecov]

Codecov Report

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

Project coverage is 53.27%. Comparing base (045a1dd) to head (c6f8d23).
Report is 3 commits behind head on main.

Files	Patch %	Lines
src/intersect.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   52.94%   53.27%   +0.33%     
==========================================
  Files          29       29              
  Lines         986      993       +7     
==========================================
+ Hits          522      529       +7     
  Misses        464      464              

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