chore: Show correct path when example has lint errors

[alexandear]

Let's assume example/simple/main.go contains a lint issue fmt.Printf("Enter GitHub username: ") and we run ./script/lint.sh.

Before (duplicated example in the issued file path):

$ ./script/lint.shlinting .0 issues.linting example/Users/alexandear/src/github.com/google/go-github/exampleexample/example/simple/main.go:27:2: unnecessary-format: unnecessary use of formatting function "fmt.Printf", you can replace it with "fmt.Print" or "fmt.Println" (revive) fmt.Printf("Enter GitHub username: ") ^1 issues:* revive: 1failed linting example

After:

$ ./script/lint.shlinting .0 issues.linting example/Users/alexandear/src/github.com/google/go-github/exampleexample/simple/main.go:27:2: unnecessary-format: unnecessary use of formatting function "fmt.Printf", you can replace it with "fmt.Print" or "fmt.Println" (revive) fmt.Printf("Enter GitHub username: ") ^1 issues:* revive: 1failed linting example

The fix is simple: remove --path-prefix option as not needed in v2. See https://golangci-lint.run/product/migration-guide/#runrelative-path-mode

[gmlewis]

Thank you, @alexandear!
LGTM.
Merging.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.25%. Comparing base (a81b973) to head (e450da7).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #3656 +/- ##
=======================================
Coverage 91.25% 91.25% =======================================
Files 184 184 Lines 16311 16311 =======================================
Hits 14884 14884 Misses 1245 1245 Partials 182 182 

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