fix: Typing for onLayoutConfigChange

[mofojed]

• Was typed as a () => void, rather than the type that was actually being passed back

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.52%. Comparing base (295322f) to head (ab82d8d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2622      +/-   ##
==========================================
- Coverage   49.53%   49.52%   -0.01%     
==========================================
  Files         774      774              
  Lines       43767    43767              
  Branches    11072    11072              
==========================================
- Hits        21678    21674       -4     
- Misses      22071    22075       +4     
  Partials       18       18              

Flag	Coverage Δ
unit	49.52% <ø> (-0.01%)	⬇️

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