Fix field images not disposing properly

[Gold872]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.93%. Comparing base (3e1dc36) to head (cbdfb20).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/services/field_images.dart	50.00%	2 Missing ⚠️
...draggable_containers/models/list_layout_model.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
- Coverage   63.94%   63.93%   -0.02%     
==========================================
  Files          77       77              
  Lines        7983     7983              
==========================================
- Hits         5105     5104       -1     
- Misses       2878     2879       +1     

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