Fixed checkPathAgainstBase modifying basePaths unintentionally.

[k1LoW]

Hi there. Thank you for GREAT pkgs!

I fixed a problem where checkPathAgainstBase was unintentionally changing the basePath.
Also added a test that was panicky before the fix.

$ go test ./paths/... -run TestNewValidator_FindPathMissingWithBaseURLInServer
--- FAIL: TestNewValidator_FindPathMissingWithBaseURLInServer (0.00s)
panic: runtime error: index out of range [-1] [recovered]
        panic: runtime error: index out of range [-1]

goroutine 19 [running]:
testing.tRunner.func1.2({0x100ff8840, 0x140000181e0})
        /Users/k1low/sdk/go1.22.1/src/testing/testing.go:1631 +0x1c4
testing.tRunner.func1()
        /Users/k1low/sdk/go1.22.1/src/testing/testing.go:1634 +0x33c
panic({0x100ff8840?, 0x140000181e0?})
        /Users/k1low/sdk/go1.22.1/src/runtime/panic.go:770 +0x124
github.com/pb33f/libopenapi-validator/paths.checkPathAgainstBase({0x140001cfad1, 0x5}, {0x100e467a0, 0x8}, {0x1400002a0f0, 0x1, 0x14000010140?})
        /Users/k1low/src/github.com/pb33f/libopenapi-validator/paths/paths.go:227 +0x180
github.com/pb33f/libopenapi-validator/paths.comparePaths({0x140000782b0?, 0x1, 0x140001cfad0?}, {0x1400002a110, 0x1, 0x1}, {0x1400002a0f0, 0x1, 0x1})
        /Users/k1low/src/github.com/pb33f/libopenapi-validator/paths/paths.go:261 +0x1f0
github.com/pb33f/libopenapi-validator/paths.FindPath(0x14000000120, 0x14000394000)
        /Users/k1low/src/github.com/pb33f/libopenapi-validator/paths/paths.go:66 +0x270
github.com/pb33f/libopenapi-validator/paths.TestNewValidator_FindPathMissingWithBaseURLInServer(0x140001d0b60)
        /Users/k1low/src/github.com/pb33f/libopenapi-validator/paths/paths_test.go:657 +0xd0
testing.tRunner(0x140001d0b60, 0x101066d18)
        /Users/k1low/sdk/go1.22.1/src/testing/testing.go:1689 +0xec
created by testing.(*T).Run in goroutine 1
        /Users/k1low/sdk/go1.22.1/src/testing/testing.go:1742 +0x318
FAIL    github.com/pb33f/libopenapi-validator/paths     0.200s
FAIL

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.96%. Comparing base (f866c7b) to head (d929361).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #60   +/-   ##
=======================================
  Coverage   98.96%   98.96%           
=======================================
  Files          19       19           
  Lines        1156     1156           
=======================================
  Hits         1144     1144           
  Misses         12       12           

Flag	Coverage Δ
unittests	98.96% <100.00%> (ø)

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[daveshanley]

LGTM! Thank you for your contribution!