fixup! fixup! test: update test-debugger-scripts to use await/async -fix lint errors

Author: Trott

test/sequential/test-debugger-scripts.js

@@ -38,5 +38,5 @@ const assert = require('assert');
     } finally {
       await cli.quit();
     }
-  })().then(common.mustCall);
+  })().then(common.mustCall());
 }