Fix badly worded error (#64)

Author: jspiro

internal/check/valid_owner.go

@@ -243,7 +243,7 @@ func (v *ValidOwner) validateTeam(ctx context.Context, name string) *validateErr
 
 	if !teamHasWritePermission() {
 		return newValidateError(
-			"Team %q cannot review PRs on %q as neither it nor any parent team does not have write permissions.",
+			"Team %q cannot review PRs on %q as neither it nor any parent team has write permissions.",
 			team, v.orgRepoName)
 	}
 

tests/integration/testdata/TestCheckFailures/owners.golden.txt

@@ -22,7 +22,7 @@
     [err] line 15: Team "masters" does not have permissions associated with the repository "codeowners-samples".
     [err] line 15: Team "monarchy" does not have permissions associated with the repository "codeowners-samples".
     [err] line 15: Team "naturals" does not have permissions associated with the repository "codeowners-samples".
-    [err] line 15: Team "ninjas" cannot review PRs on "codeowners-samples" as neither it nor any parent team does not have write permissions.
+    [err] line 15: Team "ninjas" cannot review PRs on "codeowners-samples" as neither it nor any parent team has write permissions.
     [err] line 15: Team "outliers" does not have permissions associated with the repository "codeowners-samples".
     [err] line 15: Team "peak-performers" does not have permissions associated with the repository "codeowners-samples".
     [err] line 15: Team "power" does not have permissions associated with the repository "codeowners-samples".
@@ -35,7 +35,7 @@
     [err] line 15: Team "titans" does not have permissions associated with the repository "codeowners-samples".
     [err] line 15: Team "tribe" does not have permissions associated with the repository "codeowners-samples".
     [err] line 15: Team "united" does not have permissions associated with the repository "codeowners-samples".
-    [err] line 15: Team "vikings" cannot review PRs on "codeowners-samples" as neither it nor any parent team does not have write permissions.
+    [err] line 15: Team "vikings" cannot review PRs on "codeowners-samples" as neither it nor any parent team has write permissions.
     [err] line 15: Team "warriors" does not have permissions associated with the repository "codeowners-samples".
     [err] line 15: Team "wolf-pack" does not have permissions associated with the repository "codeowners-samples".
     [err] line 17: Team "not-existing-team" does not exist in organization "gh-codeowners".