Switch test expectations to use unix-style paths

Author: smowton

go/ql/integration-tests/all-platforms/go/configure-baseline/test.py

@@ -6,4 +6,4 @@ def test(codeql, go):
     baseline_info_path = os.path.join("test-db", "baseline-info.json")
     with open(baseline_info_path, "r") as f:
         baseline_info = json.load(f)
-    assert set(baseline_info["languages"]["go"]["files"]) == set(["root.go", os.path.join("c", "vendor", "cvendor.go")]), "Expected root.go and cvendor.go in baseline"
+    assert set(baseline_info["languages"]["go"]["files"]) == set(["root.go", "c/vendor/cvendor.go")]), "Expected root.go and cvendor.go in baseline"