add types for useSearchParams in wouter-preact

[BlockOG]

fixes #515

[stackblitz]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e06a29f) to head (9acfa52).
Report is 2 commits behind head on v3.

Additional details and impacted files

@@            Coverage Diff            @@
##                v3      #516   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            1         1           
=========================================
  Hits             1         1           

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[molefrog]

Thanks!