fix: correctly identify .roo folder in multi-root workspaces #13328

Job	Run time
platform-unit-test (windows-latest)	6m 19s
knip	45s
platform-unit-test (ubuntu-latest)	3m 41s
check-openrouter-api-key	2s
compile	1m 57s
check-translations	39s
integration-test	7m 1s
notify-slack-on-failure	0s
	20m 24s

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