[receiver/filestats] fix file.path value #28621

Job	Run time
collector-build	5m 9s
docker-build	5m 15s
supervisor-test	46s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 43s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	4m 22s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 19s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 21s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 40s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	4m 34s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	5m 34s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 26s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	4m 38s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 36s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 13s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 31s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 57s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	5m 52s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 9s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	4m 31s
kubernetes-test	1s
	1h 22m 37s

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