fix(map): correct opacity for marker icons

[AlexaM2]

Closes #1865

Review checklist

• Terms and conditions reflect the changes

View Changes

• Description has screenshots of the UI changes.
• Tested both in light and dark mode.
• New text is both in portuguese (PT) and english (EN).
• Works in different text zoom levels.
• Works in different screen sizes.

Performance

• No helper functions to return widgets are added. New widgets are created instead.
• Used ListView.builder for Long Lists.
• Controllers (TextEditingController, ...) are beeing disposed of in dispose() method.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 6%. Comparing base (c5a225a) to head (8f0f246).
⚠️ Report is 1 commits behind head on develop.

❌ Your project check has failed because the head coverage (6%) is below the target coverage (70%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1883   +/-   ##
=======================================
  Coverage        6%      6%           
=======================================
  Files           38      38           
  Lines         2121    2121           
=======================================
  Hits           125     125           
  Misses        1996    1996           

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[goncalopinto1]

LGTM 👍