[FixRM #8419] Add module platform to ms04_011_pct

While reviewing, redmine looks like https://dev.metasploit.com/redmine/issues/8419 has been already fixed, but not this module

* Verification:

- [x] Prior fix: Run the command above, ms04_011_pct should appear

```
framework.exploits.each_module { |name, mod| puts name if mod.new.platform.platforms.empty? }; nil
```

- [x] After fix: Run the same command, should return nil