fix: parse packets for protocol 13.20

[Zbizu]

Description

This PR corrects inaccuracies in 13.20 protocol.

Behaviour

Actual

parsing these packets causes otc to desync and show errors in terminal

Expected

handle the packets the same way as vanilla (rl) client

Fixes

• terminal errors, client desync
• mentioned in Closing the client doesn't end the process sometimes #681, does NOT close it

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested

Connecting to local testserver and checking terminal.

Server was running with vanilla client for several months and the features were used by hundreds of players so I have full confidence in server side protocol being correct.

Test Configuration:

• Server Version: Kitsune 2.0 (an engine used in Noveria, built for vanilla 13.20 client)
• Client: 13.20
• Operating System: Windows 10 (client)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I checked the PR checks reports
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works