Improved droplet detection when they span the entire system

[david-zwicker]

This fixes a bug where extremely large droplets would be reported for strip-like configurations.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (2a6ee5b) 89.92% compared to head (6414659) 90.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
+ Coverage   89.92%   90.13%   +0.21%     
==========================================
  Files           8        8              
  Lines        1707     1734      +27     
==========================================
+ Hits         1535     1563      +28     
+ Misses        172      171       -1     

Flag	Coverage Δ
unittests	90.13% <95.77%> (+0.21%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
droplets/image_analysis.py	90.68% <95.77%> (+1.19%)	⬆️

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