fix(earn): android header back button

[MuckT]

Description

On Android the header back button was displayed in the status bar this should fix that issue.

Screenshots

Android Before	Android After

Test plan

• Tested locally on Android.

Related issues

N/A

Backwards compatibility

Yes

Network scalability

If a new NetworkId and/or Network are added in the future, the changes in this PR will:

• Continue to work without code changes, OR trigger a compilation error (guaranteeing we find it when a new network is added)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.32%. Comparing base (3ab8550) to head (b7e6202).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5446      +/-   ##
==========================================
+ Coverage   86.31%   86.32%   +0.01%     
==========================================
  Files         756      756              
  Lines       31205    31206       +1     
  Branches     5353     5353              
==========================================
+ Hits        26935    26939       +4     
+ Misses       4037     4034       -3     
  Partials      233      233              

Files	Coverage Δ
src/earn/EarnEnterAmount.tsx	81.09% <100.00%> (+0.09%)	⬆️

... and 1 file with indirect coverage changes

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