QA: prevent double comment by the bot

[web4er]

The bot should edit the appropriate response comment for the comment/command edited by the user.

[web4er-ubiquibot[bot]]

Available commands

- /assign: Assign the origin sender to the issue automatically.
- /unassign: Unassign the origin sender from the issue automatically.
- /help: List all available commands.
- /multiplier: Set bounty multiplier (for treasury)
- /allow: Set access control. (Admin Only)
- /wallet: <WALLET_ADDRESS | ENS_NAME>: Register the hunter's wallet address. 
  ex1: /wallet 0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266 
  ex2: /wallet vitalik.eth

@EresDev

[web4er]

TEST

I will post /help, then edit it to /wallet 0x1F9FCc0E84dc2094499b848AE37Cd6a51db03Ff2 and bot should edit its previous response instead of posting a new response.

[web4er]

/help

[web4er-ubiquibot[bot]]

Available commands

- /assign: Assign the origin sender to the issue automatically.
- /unassign: Unassign the origin sender from the issue automatically.
- /help: List all available commands.
- /multiplier: Set bounty multiplier (for treasury)
- /allow: Set access control. (Admin Only)
- /wallet: <WALLET_ADDRESS | ENS_NAME>: Register the hunter's wallet address. 
  ex1: /wallet 0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266 
  ex2: /wallet vitalik.eth

[web4er]

/wallet 0x1F9FCc0E84dc2094499b848AE37Cd6a51db03Ff2

[web4er-ubiquibot[bot]]

Updated the wallet address for @web4er successfully! Your new address: 0x1F9FCc0E84dc2094499b848AE37Cd6a51db03Ff2