Remove 150 message limit for ping command

[Lewdcario]

/lead ping bugfix

The 150 character limit for the ping command was unnecessary, so this is being removed

• [x] - There are no unrelated changes
• [x] - Running yarn test does not throw any errors
• [x] - I ran yarn lint to make sure my codebase is consistent
• [x] - I link to the relevant issues to be closed, if applicable