chore: fix prlinter integ test check (aws#19521)

fixes pr linter, currently failing aws#19519

----

### All Submissions:

* [x] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/master/INTEGRATION_TESTS.md)?
	* [ ] Did you use `cdk-integ` to deploy the infrastructure and generate the snapshot (i.e. `cdk-integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

tools/@aws-cdk/prlint/lint.ts

@@ -45,7 +45,7 @@ function testChanged(files: any[]) {
 }
 
 function integTestChanged(files: any[]) {
-  return files.filter(f => f.filename.toLowerCase().match(/^integ.*.ts$/)).length != 0;
+  return files.filter(f => f.filename.toLowerCase().match(/integ.*.ts$/)).length != 0;
 }
 
 function readmeChanged(files: any[]) {