fix: Swap arguments of isAssignableFrom

[aababilov]

Consider we want to inject a ChildCurrentDateTime class. This assignment
is invalid:

ChildCurrentDateTime param = new CurrentDateTime();

It may be only the other way:

CurrentDateTime param = new ChildCurrentDateTime();

See also the valid implementation:

  private static boolean isInjectableFromContext(Class<?> parameterType) {
    return parameterType.isAssignableFrom(CurrentDateTime.class)
        || parameterType.isAssignableFrom(CountryCode.class);
  }

[barbeau]

👍