fix(settings): header shown as white when bottom sheet is open

[MuckT]

Description

When the bottom sheet was opened on setting the header was shown in white instead of the same gray opaque seen on the rest of the screen. This PR fixes that on Android and iOS.

Screenshots

iOS Before	Android Before	iOS After	Android After

Test plan

• Tested locally on iOS
• Tested locally on Android

Related issues

• Fixes ACT-1153

Backwards compatibility

Yes

Network scalability

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.41%. Comparing base (9adf90e) to head (71bedac).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5467      +/-   ##
==========================================
+ Coverage   86.37%   86.41%   +0.03%     
==========================================
  Files         757      761       +4     
  Lines       31300    31365      +65     
  Branches     5383     5390       +7     
==========================================
+ Hits        27035    27103      +68     
+ Misses       4034     4031       -3     
  Partials      231      231              

Files	Coverage Δ
src/account/Settings.tsx	91.62% <100.00%> (+0.11%)	⬆️

... and 15 files with indirect coverage changes

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seems like CustomHeader is a better solution