fix: binary image updated sensors not working

[firstof9]

Proposed change

Fix binary sensors when image is updated from the "no mail" images.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests
• Documentation update
• Adds a new shipper
• Update existing shipper

Additional information

• This PR fixes or closes issue: fixes ISSUE: Regression, binary sensor no longer indicates if there is a real image available #996

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.49%. Comparing base (8608d22) to head (ed2c905).
Report is 40 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #997      +/-   ##
==========================================
- Coverage   95.07%   93.49%   -1.58%     
==========================================
  Files           8        8              
  Lines        1482     1614     +132     
==========================================
+ Hits         1409     1509     +100     
- Misses         73      105      +32     

Files with missing lines	Coverage Δ
...stom_components/mail_and_packages/binary_sensor.py	84.21% <100.00%> (-12.98%)	⬇️
custom_components/mail_and_packages/helpers.py	92.94% <100.00%> (-1.79%)	⬇️

... and 2 files with indirect coverage changes