[BUG] use of undefined variable

[genzyy]

Describe the bug

In this file customMessage is being used which is actually an undefined variable in the codebase and because of this its failing atleast for me when I run the bot locally on my discord server.

To Reproduce

1. Run the bot locally according to the instructions given in the root folder readme.
2. Try out the bot on your server by sending messages with restricted words and for warnings.
3. You will get an error in your terminal/command line that the app has crashed and customMessage is undefined.

Expected Behavior

Instead of customMessage, use warningMessage which is defined in the file.

Screenshot/ Video

Desktop (please complete the following information)

Device - Lenovo Legion Y530
OS - Arch Linux
Browser - Firefox/Discord
Version - Linux 5.15.12-arch1-1

Additional context

No response

[github-actions]

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