Typo in error message for enabling debug mode

[ReinierMaas]

Thanks for the helpful message:

https://github.com/gitkraken/vscode-gitlens/blame/e008d7db0dca2dab9c1979da27ab7c5de6e88a82/src/extension.ts#L60-L62

I found a typo in it: Is missing the second ":

"gitlens.outputLevel": "debug",

[github-actions]

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