Add leading slash to type

[felickz]

        "/node_modules/vm2/package.json": {
            "name": "/node_modules/vm2/package.json",
            "file": {
                "source_location": "/node_modules/vm2/package.json"
            },
            "resolved": {
                "pkg:npm/vm2@3.9.17": {
                    "package_url": "pkg:npm/vm2@3.9.17",
                    "relationship": "direct",
                    "scope": "runtime"
                }
            }
        },

pkg:npm/vm2@3.9.17 is not detecting alerts: