Fix: basepath edge cases

[molefrog]

Closes #482 #481

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[github-actions]

size-limit report 📦

Path	Size
packages/wouter/esm/index.js	2.27 KB (+1.27% 🔺)
packages/wouter/esm/use-browser-location.js	622 B (0%)
packages/wouter/esm/memory-location.js	798 B (0%)
packages/wouter/esm/use-hash-location.js	733 B (0%)
packages/wouter-preact/esm/index.js	2.16 KB (+1.34% 🔺)
packages/wouter-preact/esm/use-browser-location.js	552 B (0%)
packages/wouter-preact/esm/use-hash-location.js	645 B (0%)
packages/wouter-preact/esm/memory-location.js	702 B (0%)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b40a6cb) to head (0f10fb9).
Report is 2 commits behind head on v3.

Additional details and impacted files

@@            Coverage Diff            @@
##                v3      #483   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            1         1           
=========================================
  Hits             1         1           

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