update postitem display

[ryuash]

Description

relates to #55 I updated post item to only list the posts with errors if specified. We can remove it completely in the future but I think profile currently currently uses it.

This PR adds an optional displayErrorPost to PostItem with a default value of false

Checklist

• [x] Targeted PR against correct branch.
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Wrote unit tests.
• [x] Run flutter format.
• [ ] Updated the documentation.
• [ ] Added an entry to the CHANGELOG.md file.
• [x] Re-reviewed Files changed in the Github PR explorer.

[codecov[bot]]

Codecov Report

Merging #127 into master will increase coverage by 0.01%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   61.76%   61.78%   +0.01%     
==========================================
  Files         266      266              
  Lines        6711     6714       +3     
==========================================
+ Hits         4145     4148       +3     
  Misses       2566     2566              

Impacted Files	Coverage Δ
lib/ui/screens/user_details_screen/index.dart	82.14% <0.00%> (ø)
.../screens/home_screen/widgets/posts_list/index.dart	69.86% <85.71%> (+0.41%)	:arrow_up:
lib/ui/blocs/posts_list/posts_list_state.dart	70.58% <100.00%> (+2.84%)	:arrow_up:
lib/ui/widgets/posts_list_item/index.dart	65.62% <100.00%> (-1.05%)	:arrow_down:

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