Small refactoring of modules/private (#15947)

* Use correct variable name.

* doer is never nil here.

* Use status code constants.

* Replaced generic map with concrete struct.

* Fixed windows lint.

* Removed unused method.

* Changed error codes.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

cmd/hook.go

@@ -179,7 +179,7 @@ Gitea or set your environment appropriately.`, "")
 		GitObjectDirectory:              os.Getenv(private.GitObjectDirectory),
 		GitQuarantinePath:               os.Getenv(private.GitQuarantinePath),
 		GitPushOptions:                  pushOptions(),
-		ProtectedBranchID:               prID,
+		PullRequestID:                   prID,
 		IsDeployKey:                     isDeployKey,
 	}