Fix opening bmlab files with multiple repetitions

[raimund-schluessler]

Because I am obviously stupid 🙈🙃, the implementation of #22 had an issue with opening bmlab files with multiple repetitions. This fixes it. We should add a bmlab test file for checking this, but I don't have a small enough file at hand at the moment. @juko1 This fixes https://github.com/BrillouinMicroscopy/BMicro/issues/150.

[codecov-commenter]

Codecov Report

Merging #26 (5b46c31) into main (17102d8) will increase coverage by 0.59%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   77.64%   78.24%   +0.59%     
==========================================
  Files          35       35              
  Lines        2425     2482      +57     
==========================================
+ Hits         1883     1942      +59     
+ Misses        542      540       -2     

Impacted Files	Coverage Δ
impose/formats/fmt_bm_bmlab.py	100.00% <100.00%> (+3.77%)	:arrow_up:
impose/gui/visualize.py	93.37% <0.00%> (-0.15%)	:arrow_down:
impose/flblend.py	99.39% <0.00%> (+1.07%)	:arrow_up:

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[paulmueller]

I would be happy to merge this if you added the test file. Up to 1MB is still fine I think.

[raimund-schluessler]

I would be happy to merge this if you added the test file. Up to 1MB is still fine I think.

Done. The test successfully fails without the fix in 360b371894b1bb6a2d4f6eb5861775a999adccfa 🙂