Swift: Update integration test

Author: jketema

swift/ql/integration-tests/autobuilder/xcode-fails-spm-works/Files.macos_26.expected

@@ -3,7 +3,6 @@
 
 
 @runs_on.macos
-@pytest.mark.ql_test("DB-CHECK", xfail=not runs_on.macos_26)
-@pytest.mark.ql_test("*", expected=f"{'.macos_26' if runs_on.macos_26 else ''}.expected")
+@pytest.mark.ql_test("DB-CHECK", xfail=True)
 def test(codeql, swift):
     codeql.database.create()