Fix the CSS file-scheme import test on Windows

[LukeTowers]

Follow-up to #1549, whose CombineAssetsTest::testCssImportFilterBlocksFileSchemeImport errors on every windows-latest job:

ErrorException: Undefined array key 1
vendor/assetic/framework/src/Assetic/Filter/CssImportFilter.php:158

The test's fixture built the import target as file:// + the temp file path, which on Windows is file://D:\a\.... Before the import validator runs, Assetic's CssImportFilter splits a scheme:// target on / to find its host and path, and a backslashed path has no / to split on.

The fixture now writes the path with forward slashes, which is also the valid form of a file:// URL on Windows. It's a test-only change; the Ubuntu jobs were unaffected.

Summary by CodeRabbit

• Bug Fixes
  • Improved CSS import handling for secret file paths that use platform-specific path separators.

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• modules/system/tests/classes/CombineAssetsTest.php

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