add wildcard to __init__.py (GoogleCloudPlatform#5364)

because I messed up the first time 🤦🏻‍♀️

Author: leahecole

.github/header-checker-lint.yml

@@ -1,6 +1,6 @@
 {"allowedCopyrightHolders": ["Google LLC"],
  "allowedLicenses": ["Apache-2.0", "MIT", "BSD-3"],
- "ignoreFiles": ["**/requirements.txt", "**/requirements-test.txt", "**/requirements-composer.txt", "__init__.py"],
+ "ignoreFiles": ["**/requirements.txt", "**/requirements-test.txt", "**/requirements-composer.txt", "**/__init__.py"],
  "sourceFileExtensions": [
  	"ts", 
  	"js",