Bug 1833606 - Remove removed path from whitespace lint config, r=CosminS

Differential Revision: https://phabricator.services.mozilla.com/D178599

tools/lint/file-whitespace.yml

@@ -111,7 +111,6 @@ file-whitespace:
         - testing/web-platform/tests
         - testing/web-platform/tests/conformance-checkers
         - testing/web-platform/tests/content-security-policy
-        - testing/web-platform/tests/css/tools/w3ctestlib/templates/indices.css
         - testing/web-platform/tests/html
         - testing/web-platform/tests/tools/lint/tests/dummy/broken.html
         - testing/web-platform/tests/tools/lint/tests/dummy/broken_ignored.html